We have given a series of AP 20, 17, 14, 11,…. and we have to find the 35th term of this series
Book – RS AGGARWAL, class 10, arithmetic progression, chapter 5A, question no 2(ii)
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Given: AP is 20,17,14,11,....
Here, first term =a=20
Common difference =d=17−20=−3
nth term is given by,
an=a+(n−1)d
Put n=35
a35=20+(35−1)(−3)
=−82.
The 35th term of the AP 20,17,14,11,..... is −82.