" 76."sum_(1=i)^(n)sum_(

The value of sum_(i=1)^(n) sum_(j=1)^(i) sum_(k=1)^(j) 1 is

The value of sum_(i=1)^(n)sum_(j=1)^(i)sum_(k=1)^(j)=220 , then the value of n equals

Prove the following sum_(i=1)^(n) sum_(j=1)^(n) sum_(k=1)^(n) sum_(l=1)^(n) (1)=n^(4)

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 :

alpha=lim_(n rarr oo)sum_(i=1)^(n)sum_(j=1)^(i)(j)/(n^(3)), then [(1)/(alpha)-1] is

sum_(j=1)^(n)sum_(i=1)^(n)i=

sum_(i=1)^(n) sum_(j=1)^(i)sum_(k=1)^(j) 1 equals :

sum_(i=1)^(n) sum_(j=1)^(i) sum_(k=1)^(j) 1, is equal to