Let the coefficients of x^ -1 and x^ -3 in the expansion of (2x^ 15 - 1 x^ 15 )^ 15 , x0, be m and n...

Question

Let the coefficients of x^ -1 and x^ -3 in the expansion of (2x^ 15 - 1 x^ 15 )^ 15 , x>0, be m and n respectively. If r is a positive integer such that mn^2= ^ 15 C_r 2^r, then the value of r is equal to

Accepted Answer

5

JEE Main Mathematics question

Solution

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