if in an ap if the 12th term is 13 and the sum of its first four terms is 24, find the sum of its first 10 terms
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For the 12th terms
-13 = a1 + 11d
-13 - 11d = a1
For the sum of four
24 = (4/2)(2(-13 - 11d) + 3d))
24 = 2(2(-13 - 11d + 3d)
12 = 2(-13 - 8d)
12 = -26 - 16d
38 = - 16d
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