maths
posted by Anu
The sum of first 6terms of an A.P.is 6.The product of second term and fifth term is 80.Find the terms of A.P.

Steve
(6/2)(2a+5d) = 6
(a+d)(a+4d) = 80
or,
2a+5d = 2
a^2+5ad+4d^2 = 80
Now just solve for a and d. One sequence is
14, 8, 2, 4, 10, 16
sum = 6
(8)(10) = 80
There is another value for a as well
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