The first term of an arithmetic progression is 5 and its common difference is 4

MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series

Problem

The first term of an arithmetic progression is 5 and its common difference is 4. If the nth term equals 45 and the sum of the first n terms equals 275, determine the value of n. (a) 1010 (b) 1212 (c) 99 (d) 1111

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