What is the sum of first six terms of an A.P. whose first term is 3 an – InterviewSolution

InterviewSolution

1.	What is the sum of first six terms of an A.P. whose first term is 3 and the sixth term is 27.
Answer» `S_(6)= ( 6)/(2) ( t_(1) + t_(6)) = ( 6)/(2) ( 3+ 27) = 3 xx 30 = 90` The sum is 90

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