Find n if........................

{2n C 3}÷{n C 2)=12
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1 Answer

(2n(2n-1)(2n-2)/6)÷(n(n-1)/2)=12

(2n(2n-1)(n-1)/3)÷(n(n-1)/2)=12

(2(2n-1)/3)÷1/2=12

4(2n-1)=36; 2n-1=9; 2n=10; n=5

CHECK

10C3/5C2=120/10=12 OK
by Top Rated User (1.2m points)
Ok,Thanks
by Level 4 User (7.5k points)

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