Evaluate :n!/r!(n - r)!, When n = 5, r = 2. – InterviewSolution

1.

Evaluate :n!/r!(n - r)!, When n = 5, r = 2.

Answer»

Required = 5!/2!(5 - 2)!

= 5!/(2! x 3!)

= (5 x 4 x 3!)/(2 x 1 x 3!) = 10

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