A basic question from arithmetic progression in which we have been asked to find the 15th term of the AP -40, -15, 10, 35,…
Book – RS AGGARWAL,
class 10, Arithmetic Progression, chapter 5A, question no 2(v)
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The 15th term of the AP −40,−15,10,35,...
Given: AP is −40,−15,10,35,....
Here, first term =a=−40
Common difference =d=−15−(−40)=−15+40=25
nth term is given by,
an=a+(n−1)d
n=15
a15=−40+(15−1)25
=310.