Question

The value of 1 - 2 + 3 - 4 + 5 - 6 +........... + 19 - 20 is __________.

Answer 1

Answer:

ans is -10

Step-by-step explanation:

1-2=-1

-1+3=2

2-4=-2

-2+5=-3

-3+6=3

Here we able to find that there is half of even number and the sign( +,-) is putten on the basis of sign on greater number