Summation by Sigma Method
Trending Questions
Q.
The sum of the product of the integers 1, 2, 3, ...., n taken two at a time is
n(n+1)24(3n2−n−2)
n2(n+1)22(n2+1)
n(n+1)18(n2−n−2)
n(n+1)(n+2)(n+3)24
Q. If Sn=∑4n1(−1)k(k+1)2k2. Then, Sn can take value(s)
- 1056
- 1088
- 1120
- 1332
Q. The sum of first 9 terms of the series 131+13+231+3+13+23+331+3+5+…… is
- 71
- 96
- 142
- 192
Q. IF Sn=∑nr=01nCr and tn=∑nr=0rnCr, then tnSn is equal to
- n−1
- 2n−12
- 12n−1
- 12n
Q.
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
2
5
3
4
Q. ___
Find the sum of the first 15 terms of the series 3 + 5 + 7 + 9 +. . . . . . n terms.
Q.
Find the sum of the first n natural numbers.
Q.
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