Question

find the sum of (-20)+20+(-20)+20+(-20)+... till the 3 15th term.​

Answer 1

here the terms in the odd places are negative and terms in even places are positive

therefore the sum of adjacent two terms will be 0.

This continues upto the 314th term

then only the 315th term will be left

since it is the odd place the term is (-20)

therefore the sum is -20

plz mark this as the brainliest ans

Answer 2

Answer:

Step-by-step explanation:

The sum is 10