Question

calculate 1-2+3-4+5-6+.....+179-180​

Answer 1

Answer:

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Answer 2

Answer:

Step-by-step explanation:

First, 1-2,3-4,5-6,.............179-180 all will give the answer -1. so -1 will be the difference of a pair of numbers. As there are 180 numbers, there will be 180/2 pairs totally that is 90 pairs. We know that 1 pair gives -1.Therefore, 90 pairs will give 90*-1=-90. Hope it helps...