Asked by Mustapha

The sum of first 8th terms of an A.P is 160 while the sum of 20 term is 880.Find a. The 43rd term b.The sum of 12 term
Answered by oobleck
8/2 (2a+7d) = 160
20/2 (2a+19d = 880)
solve for a and d, and then you want
a+42d
S12 = 12/2 (2a+11d)
Answered by Seyi
The 9th term of an A.P is 52 while the 12th term is 20find the of its first 20 term
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