CBSE Class 10 Answered
The sum of the third and seventh term of an A.P. is 6 and their product is 8. Find the sum of the first sixteen terms of the A.P.
Asked by Topperlearning User | 26 Jul, 2017, 01:32: PM
Expert Answer
Let the A.P. be a, a + d, a + 2d, ......
t3 + t7 = 6
2a + 8d = 6
a + 4d = 3
a = 3 - 4d… (1)
(a + 2d) (a + 6d) = 8
Using (1), we get,
(3 - 2d) (3 + 2d) = 8
9 - 4d2 = 8
If
If
Answered by | 26 Jul, 2017, 03:32: PM
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