Page 64 - Fixtures

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Permutations and Combinations

[Factorial]

5

9 5×4×3×2×1

.9×8×7

n

(n )n!

n ! = n(n − 1)(n − 2)(n − 3) 3 ×2 ×1

: 9×8×7

9×8×7 = 9×8×7×6×5×4×3×2×1 = 9!
6×5×4×3×2×1 6!

TY