🧮 Formula sheet
- 1.nPr = n! / (n−r)!
- 2.nCr = n! / [r!(n−r)!]
- 3.nCr = nC(n−r)
- 4.nC0 + nC1 + ... + nCn = 2ⁿ
- 5.Circular arrangement (clockwise = anticlockwise): (n−1)!/2
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Quantitative Aptitude (Maths, LR, Stats)
Ch 2 · Permutations and Combinations
5 concept points · 5 formulas · 4 exam-critical points.