# Arithmetic Progressions

The second term of an arithmetic progression I four times the fits term, and the first term is ten.
Find the common difference and hence find the sum of the first 12 terms.

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1. a+d = 4a
a = 10

10+d = 40
d = 30

S12 = 12/2 (2*10 + 11*30)

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2. The sum of the 3rd and 7th term of an AP is 38 and the 9th term is 37.find the AP

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