# The Additive Inverse of S,

Where S=1-2+3-4+5-6+7-8+ ……….+49-50, is

- -25
- 1
- 0
- 25

**Answer; (4) 25**

**Explanation:- **S = 1 – 2 + 3 – 4 + 5 – 6 + 7 – 8 + ……………… + 49 – 50

If 1 – 2 + 3 – 4 = – 3

and 1 – 2 + 3 – 4 + 5 = 3

Similarly,

1 – 2 + 3 – 4 + 5 – 6 + 7 – 8 ……………. + 49 – 50 = – 25

Then, S = – 25

Then, the addictive inverse of S( – 25 )= 25

Hence, the answer is (4) 25.