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If x,|x+a|,|x-1| are first three terms o...

If `x,|x+a|,|x-1|` are first three terms of an A.P., then the sum of its first 20 terms is

A

90 or 175

B

180 or 350

C

360 or 700

D

720 or 1400

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The correct Answer is:
B
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