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The forth term of an A.P is four times the first term. The sixth term is sixty, find the sum of 30 terms, common difference, and the first term.

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Use what you know about Aps. They have told you that
a+3d = 4a
a+5d = 60
Solve for a and d, and then
S30 = 30/2 (2a+29d)

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