Question

Find the sum of the first 25 terms of an ap whose nth term is given by tn=7-3n

Answer 1

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Answer 2

It is given that nth term is 7-3n
So, require AP= 4, 1, -3........
With first term (a) = 4 and (d) = -3

Sum to 25 terms= 25/2{2×4+(25-1)(-3)}
or, sum of 25 terms = 25/2{8-72}
So, sum to 25 term= -800

Hence the answer is -800


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