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Find 'x' if 1 + 4 + 7 + 10 + ........ + ...

Find 'x' if `1 + 4 + 7 + 10 + ........ + x = 287`.

Text Solution

Verified by Experts

The correct Answer is:
`a_(14) = 1 + (14-1) 3 =1 + (13 xx 3) =1 + 39 = 40`
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