Question

(-1)-(-1)^1-(-1)^2-(-1)^3......-(-1)^99-(-1)^100

Answer 1

Since number of terms are odd, all terms starting from power of 1 to 100 will cancel and only the 1st term will be left out.

So, answer is -1.

Answer 2

=> -1+1-1..........+1-1=-1