Consider an arithmetic progression whose first term is 8 and common difference is 5

MATHEMATICS · Subjective · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

Consider an arithmetic progression whose first term is 8 and common difference is 5. (i) Let

S_n

denote the sum of the first

n

terms. Write an expression for

S_n

in terms of

n

. (ii) Determine the least value of

n

for which

S_n

exceeds 400.