Question

Evaluate
n!/(n-r)!
when
(i) n=6, r= 2
(ii) n = 9,r=5.​

Answer 1

Answer:

for

1.n!/(n-r)!=6!/4!=6×5×4!/4!=6×5=30

2.9!/4!=9×8×7×6×5×4!/4!=9×8×7×6×5=15120

Answer 2

Answer:

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