The sum of n terms of the following series 1 + (1 + x) + (1 + x + x2) +... will be
None of the above
If A1, A2; G1, G2 and H1, H2 be two AM's, GM's and HM's between two quantities, then the value of is
12 + 1 + 22 + 2 + 32 + 3 + ... + n2 + n is equal to
C.
Given series is,
12 + 1 + 22 + 2 + 32 + 3 + ... + n2 + n
=
Let a, b and c be in AP and . If x = 1 + a + a2 + ... to , y = 1 + b + b2 + ... to , z = 1 + c + c2 + ... to , then x, y and z are in
AP
GP
HP
None of these