Find Ap whose nth term is given by an =9-5 find
Sum of first term of ap
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Answer:
Last term = 9-5n
a+ (n-1)d = 9-5n
a+ nd - d = 9-5 n
a - d = 9 and nd = -5n⇔ d = -5
a - (-5) = 9 ⇔ a = 4
l = 9-5(15) = 9-75 = -66
sum = N/2 (a+ l) = 15/2 (4-66) = -31*15 = -465
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