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Question

Find S15 of the following A.P.:
4,8,12,...

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Solution

a=4,
d=t2t1=84=4, where t2,t1 are the 1st and 2nd term of the A.P.
S15=n2[2a+(n1)d]
=152[2×4+(151)×4]
=152×[8+56]
=152×64
=480.

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