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Question

1+2+3+4+5++27= ?

A
378
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B
376
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C
372
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D
380
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Solution

The correct option is A 378

The AP corresponding to the given series is 1, 2, 3,..., 27.

Sum of n natural numbers is given by
Sn = n(n+1)2.

S27=27(27+1)2 =27×282 =27×14 =378


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