Question

The sum of infinite term of 1 - 1 upon 3 + 1 upon 3 square 1 - 3 cube + upto infinity

Answer 1

Answer-

Required sequence form a geometric progression with a=1 and r=-3

As we know sum of any infinite gp is given by a/1-r

Putting values

S = a/1-r

S= 1/4

Hence the sum is 1/4