A basic and conceptual question from arithmetic progression chapter in which we have been asked to find which term of the AP 72, 68, 64, 60,…..is 0?
Book- RS AGGARWAL, arithmetic progression, chapter 5A, question no 11
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AP is 72,68,64,60,....
Let nth term is 0.
Here,
First term =a=72
Common difference =d=68−72=−4
an=a+(n−1)d
0=72+(n−1)(−4)
−72=−4(n−1)
n−1=18
n=18+1=19
Therefore, 0 is the 19th term.