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Question

Find the value of 1 - 2 - 3, 2 - 3 - 4,…upto 200 terms.

A
-20700
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B
20700
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C
-40600
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D
40600
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Solution

The correct option is A -20700
The AP is -4, -5, -6 etc
An=4+199×1=203Sn=2002(4203)=20700

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