Permutations and Combinations

Videos

As Simple as Counting Part 1

201

See How Its Done

404

As Simple as Counting Part 2

53

Introducing Permutations

193

To Repeat or Not to Repeat!

264

325

Permutation with and without Repetition

71

n Things, Not All Different, Taken All at a Time

389

Some Solved Examples

421

439

Mutinomial Theorem

391

Solved Examples on Multinomial Theorem Part 1

196

Solved Examples on Multinomial Theorem Part 2

246

Couple of Solved Ones Part 1

158

Couple of Solved Ones Part 2

195

A Tricky Question Solved

298

JEE Main Analysis

134

155

Position of the word

199

An imporatant relation

93

156

Possible divisors

60

121

221

Number of solutions

286

136

217

141

Combination based on geometry

147

216

140

Analysis of Advanced Paper

125

Geometry Models Part 1

185

Geometry Models Part 2

271

Geometry Models Part 3

187

Geometry Models Part 4

148

Geometry Models Part 5

135

Geometry Models Part 6

95

Geometry Models Part 7

190

Geometry Models Part 8

126

Geometry Models Part 9

65

Geometry Models Part 10

178

Geometry Models Part 11

119

Geometry Models Part 12

289

Formation of Groups Part 1

174

Formation of Groups Part 2

113

Formation of Groups Part 3

82

Formation of Groups Part 4

209

Formation of Groups Part 5

157

Formation of Groups Part 6

337

Formation of Groups Part 7

165

Formation of Groups Part 8

347

Total Selection Part 1

315

Total Selection Part 2

237

Total Selection Part 3

233

Total Selection Part 4

236

Circular Permutations Part 1

245

Circular Permutations Part 2

77

Circular Permutations Part 3

272

Circular Permutations Part 4

167

Circular Permutations Part 5

199

Circular Permutations Part 6

130

Derangement Part 1

57

Derangement Part 3

594

Derangement Part 4

77

Derangement Part 5

113

Derangement Part 6

399

Derangement Part 2

262

Introduction to Multiplication Rule of Counting

333

Multiplication Rule of Counting in Generalised Form

310

Introduction to Multiplication Rule of Counting

341

Multiplication Rule of Counting in Generalised Form

308

Introduction to Addition Rule of Counting

250

Addition Rule of Counting in Generalised Form

109

Factorial Notation

414

Restrictions on Factorial

73

Definition of Permutation

441

Mathematical Meaning of nPr

351

392

Selection followed by Arrangement

560

416

125

126

296

142

Gap Method Under Restriction

227

Gap Method Under Restriction

635

Introduction to Circular Permutations

650

Circular Permutation of 3 Distinct Objects

388

Circular Permutation of n Distinct Objects

344

Circular Permutation of n Distinct Objects

126

Restricted Circular permutations

363

Combinations Followed by Circular Permutation

186

Effects of Clockwise or Anticlockwise Direction

487

Formation of 2 Groups of Unequal Sizes

596

Formation of 2 Group of Unequal Size and Distribution

183

Formation of Two Groups of Equal Sizes

721

Formation of Two Group of Equal Size and Distribution

210

Selection from Distinct Elements in None, One or More Ways

694

Selection from Distinct Elements in None, One or More Ways using 2^n

521

Selection from Identical Elements of One Kind in None, One or More Ways

603

Total Selections of Identical Objects of More than One Kinds

967

Selection of at least One of Identical Objects of More than One Kinds

133

Selection of at least One of Identical Objects of More than One Kinds

595

Number of Lines from Non Collinear Points

416

Number of Lines using n Points in a Plane

405

Number of Triangles from Non-Collinear Points

232

Number of Triangles from n Points

159

Points of Intersection of Distinct Lines

599

Number of Diagonals in a Polygon

504

Distribution of n Distinct Items in m Boxes

507

Distribution of r Items from n Distinct Items in m Boxes

143

Identical Items to Distinct Boxes

508

Beggar's Method for None, One or More

291

Beggar's Method for Non Empty Box

223

Application of Fundamental Principle of Counting

570

Exponent of prime in n!

238

Application of Fundamental Principle of Counting

279

Properties of nPr Part-2

111

Properties of nPr Part-3

115

Properties of nCr Part-1

114

Properties of nCr Part-2

167

Permutation When Repetition of one item is allowed

461

Permutation When Some Objects are repeated

393

Formation of Groups of Unequal Sizes

319

Formation of Groups of Equal Sizes

259

Number of Divisors and Their Sum

158

Number as Product of Two Factors

367

Number as Product of Two Co-prime Factors

413

Number of Parallelograms and Squares

140

Inclusion and Exclusion

419

594

Applications of Beggar's Method Part-1

299

Distinct Items to Distinct Boxes, None of the Boxes remain Empty

369

Combination under Restriction

238

"Permutation under Restricted Domain"

310

701

Maximum Points of Intersection of Circles

75

Non Negative Integral Solutions for Inequalities

194

57

Distinct Items to Distinct Boxes, None of the Boxes remain Empty(Using Inclusion/Exclusion)

240

Distinct Items to Distinct Boxes, None of the Boxes remain Empty(Using Formula )

463

Distinct Items to Distinct Boxes, None of the Boxes remain Empty(Using Formula )

62

Inclusion and Exclusion with 2 sets

99

Inclusion and Exclusion with n sets

78

292

Formula of Derangements

699

Practice: Derangements

40

Practice: Derangements

43

Number of Parallelograms between parallel lines

168

Number of Square in Chess

563

Summary and Practice

49

Number of Triangles From the Vertices of a Polygon

165

Number of Triangles From One Side is Common With Polygon

258

Number of Triangles From Two Sides are Common With Polygon

144

Number of Triangles When No Sides are Common With Polygon

226

Summary and Practice

34

Maximum Points of Intersection of Unequal Circles

271

Maximum Points of Intersection of m lines and n circles

226

Practice: Geometrical Applications of PnC

25

Number of Divisors

453

Sum of Divisors

207

Number as Product of Two Factors

222

Number as Product of Two Coprime Factors

254

Practice: Divisors of a Number

52

Formation of 3 Groups of Unequal Size and Distribution

354

Formation of k Groups of Unequal Size and Distribution

80

Formation of 3 Groups of Equal Size

455

Formation of k Groups of Equal Size and Distribution

102

Revisiting Concepts of Formation of Groups

643

Inclusion and exclusion with 2 sets

73

Number of Rectangle in Chess

106

307

920

268

308

433

378

195

260

228

414

148

783

188

100

172

215

199

251

300

427

160

273

273

223

119

145

283

190

322

109

337

187

182

187

245

534

631

229

229

197

122

157

165

283

106

263

255

220

166

228

231

186

252

291

322

322

349

535

332

785

185

206

459

114

131

432

356

397

73

556

188

188

344

337

142

225

259

329

220

295

271

203

393

246

482

642

673

218

317

362

69

192

312

160

249

545

347

505

233

202

202

121

199

174

519

325

84

250

231

133

228

228

243

198

302

245

365

275

391

206

725

651

426

128

208

303

444

567

292

309

369

237

277

431

126

357

302

262

642

571

483

125

103

130

120

483

211

386

445

276

505

505

297

425

241

300

85

196

186

213

217

228

364

346

128

236

166

381

499

539

735

365

191

381

291

371

274

168

224

239

301

314

107

143

200

115

146

149

99

223

105

219

180

228

142

160

178

116

212

497

270

205

290

239

281

167

253

628

380

202

170

302

169

212

271

226

238

171

279

377

366

326

250

310

180

181

382

181

822

789

75

111

242

179

94

209

243

259

337

693

356

167

167

548

365

387

390

666

329

178

307

311

284

340

500

81

75

340

139

255

304

365

248

392

417

369

477

347

347

269

269

242

403

228

426

387

341

217

367

342

308

201

291

558

372

867

648

638

193

199

169

215

275

541

324

381

354

369

127

125

341

342

189

478

203

Number of Rectangle in Chess

106