A basic question from arithmetic progression chapter in which we have been asked to find which term of the AP 3, 8, 13, 18,…….is 88?
Book – RS AGGARWAL, class 10, Arithmetic Progression, chapter 5A, question no 10
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Let nth term is 88.
AP is 3,8,13,18,....
Here,
First term =a=3
Common difference =d=8−3=5
nth term of AP is an=a+(n−1)d
Now,
88=3+(n−1)(5)
88−3=(n−1)×5
n−1=88/5
or n=17+1=18
Therefore, 88 is the 18th term.