Question

xample 5 : If the sum of first n terms of an AP is 2n(n+3), then find the series.
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Answer 1

Step-by-step explanation

:if sum is is equal to 2n(n+3),then

2n^2 +6n= sum of n terms

Therefore,.....

First term = 2×1 +6×1

=8

2nd term = first term -[sum of first two terms]

=12

Therefore . AP = 8,12,16,20....