" 4.If "sum n=210," then "sum n^(2)=

If sum n=210 , then sum n^2 is equal to:

sum n = 10, sum n^(3) = ……………

sum n = 5 . Then sum n^3 =

If sum_(r=1)^(n) r=210, then : sum_(r=1)^(n) r^(2) =

If sum n=210 then find the value of sum n^(2)

If (sum n^(3))(sum n)=(sum n^(2))^(2) , then

If sum_(r=1)^(n)t_(r)=sum_(k=1)^(n)sum_(j=1)^(k)sum_(i=1)^(j)2, then sum_(r=1)^(n)(1)/(t_(r))=

If sum_(r=1)^(n) t_(r ) = sum_(k=1)^(n) sum_(j=1)^(k) sum_(i=1)^(j) 2 , then sum_(r=1)^(n) (1)/( t_(r )) equals :

If sum_(k=1)^(n)k=210, find the value of sum_(k=1)^(n)k^(2).