Question

Calculate 1 - 2 + 3 - 4 + 5 - ............. - 179 + 180 easy methord

Answer 1

In question we observe that

every two term on calculation give -1

that is

1- 2= -1

3 - 4 = -1

5 - 6 = -1

.

.

.

.

178 - 179 = -1

so

total number of term = 180

so

total number of -1 we get= 180/2 = 90.

so result is = 90*(-1)= -90

Answer 2

Step-by-step explanation:

Answer :-

Answer :--90

Answer :--90 Reason:-

There is difference of - 1 and +1

Hence last term is 180

Therefore

$\frac{180}{2} \times - 1$

$= - 90$