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how to solve

1/100-2/100+3/100-4/100+....+99/100-1??

and this??

-1/100+2/100-3/100+4/100-....-99/100+1??

1 answer

You have

1-2 + 3-4 + ... + 99-100
= (-1) + (-1) + (-1) ... + (-1) (50 times)
= -50

Naturally, the 2nd sum is then +50

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