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anonymous
 5 years ago
find n such that C(n,2)=91
anonymous
 5 years ago
find n such that C(n,2)=91

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Whoops, haha you're right.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0That's because C(n, 2) = n(n1)/2. So you want to solve n(n1)/2 = 91. But then that’s n(n1) = 182. But factors of 182 are just 2*7*13. So we can see 182 = 13*14, so n = 14.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0but something u know not by calculation, by your own experience.......
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