n-4C4=15

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n-4C4=15

Posted by Partap Antaal 7 years, 8 months ago

CBSE > Class 11 > Mathematics

1 answers

Yatin Kamra 4 years, 5 months ago

(n-4)!/4!(n-4-4)! = 15 (n-4)!/4!(n-8)! = 15 (n-4)!/24(n-8)! = 15 (n-4)!/(n-8)(n-7)(n-6)(n-5)(n-4)! = 15×24 (n-8)(n-7)(n-6)(n-5) = 360 [n = 10] answer.

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