Summation by Sigma Method
The sum of the product of the integers 1, 2, 3, ...., n taken two at a time is
Q. If Sn=∑4n1(−1)k(k+1)2k2. Then, Sn can take value(s)
Q. The sum of first 9 terms of the series 131+13+231+3+13+23+331+3+5+…… is
Q. IF Sn=∑nr=01nCr and tn=∑nr=0rnCr, then tnSn is equal to
A series in G.P. consists of an even number of terms. If the sum of all the terms is 5 times the sum of the terms occupying odd places, then the common ratio will be equal to
Find the sum of the first 15 terms of the series 3 + 5 + 7 + 9 +. . . . . . n terms.
Find the sum of the first n natural numbers.
If the sum of the n terms of G.P. is S product is P and sum of their inverse is R, than P2 is equal to