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

-20700

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20700

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-40600

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40600

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Solution

The correct option is A -20700
The AP is -4, -5, -6 etc
$A_{n} = - 4 + 199 \times - 1 = - 203 S_{n} = \frac{200}{2} (- 4 - 203) = - 20700$

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