The ratio of sum of squares of first n natural numbers to square of sum of first n natural numbers is 17:325. the value of n is	Choose the correct choice:  A) 15  B) 25  C) 35  D) 30  E) none of these
sum of 1st n natural no.s is n(n+1)/2,   sum of sqaures of 1st n natural no.s is n(n+1)(2n+1)/6,   The ratio of sum of squares of first n natural numbers to square of sum of first n natural numbers=n(n+1)(2n+1)*2*2/(n*n*(n+1)*(n+1))   =2(2n+1)/(3n(n+1))   now by hit and trial for the given options,if we put 25 then this will give 17/325   therefore the answer is 25   ANSWER:25
<result>B</result>
The ratio of sum of squares of first n natural numbers to square of sum of first n natural numbers is 17:325. the value of n is