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What is the sum of first six terms of an...

What is the sum of first six terms of an A.P. whose first term is 3 and the sixth term is 27.

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`S_(6)= ( 6)/(2) ( t_(1) + t_(6)) = ( 6)/(2) ( 3+ 27) = 3 xx 30 = 90`
The sum is 90
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