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The fourth term of an AP is 11 and the eighth term exceeds twice the fourth term by five.Find the AP and the sum of first 50 te...Asked by Pawan
The fourth term of an AP is 11 and the eighth term exceeds twice the fourth term by 5. Find the AP and the sum of first 20 terms
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Answered by
Steve
a+3d=11
a+7d=2*11+5
Solve for a and d, and then, of course,
S20 = 10(2a+19d)
a+7d=2*11+5
Solve for a and d, and then, of course,
S20 = 10(2a+19d)