CBSE NCERT Solutions Chapter 5 Arithmetic Progressions Exercise 5.2 Question 17
17. Find the 20th term from the last term of the AP: 3, 8, 13, …., 253.
Solution:
We want to find 20th term from the last term of given AP. So, lets write given AP in this way: 253, …, 13, 8, 3.
First term = a = 253
Common Difference = d= 8 – 13 = -5
Using formula
, to find nth term of arithmetic progression, we can say that
Therefore, the 20th term from the last term of given AP is 158.
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