If the mean of nobsenrations12 ,22,32………n2 is 46n11, then n is equal to
11
12
23
22
According to the given condition,
12+22+32+…+n2n=46n11⇒n(n+1)(2n+1)6n=46n11⇒112n2+3n+1=276n⇒22n2−243n+11=0⇒(n−11)(22n−1)=0⇒n=11