Asked by Franklin
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.
Answers
Answered by
oobleck
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)
a+3d = 4a
a+5d = 60
Solve for a and d, and then
S30 = 30/2 (2a+29d)
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