Question

find the sum -1+1+(-1)+1(-1) if there are 101 terms​

Answer 1

Answer: -1

Explanation:

Every nth term is -1 where n is not divisible by 2,

Since 101 is an odd number, the 101th term is -1 and the series ends with it

-1+1+(-1)+1+(-1)+...101 terms = (-1+1)+(-1+1)+...+(-1+1)+(-1)

= 0+0+...+0+(-1) = -1

Hope it helped