In an arithmetic sequence an, if a1 = 5 and d = 3, find a72. A) 216 B) 218 C) 221 D) 223

Mathematics · College · Tue Nov 03 2020

Answered on

Given:

a1 =5

d =3

Find a72

n = 72

Formula for Arithmetic Sequence:

An = a1 + (n - 1)d

Solution:

Substitute the given values of a1, n and d to the formula for arithmetic sequence.

A72 = 5 + ( 72 - 1) 3

A72 = 5 + (71)3

A72 = 5 + 213

A72 =218

Final answer:

A72 =218

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