Q. 2 A4.5( 21 Votes )

Find:

the 20th term of the AP 9, 13, 17, 21, ... .

Answer :

Here, First term = a = 9

Common difference = d = 13 - 9 = 4


To find = 20th term, n = 20


Using the formula for finding nth term of an A.P.,


an = a + (n - 1) × d


an = 9 + (20 - 1) × 4


an = 9 + 19 × 4 = 9 + 76 = 85


20th term of the given AP is 85.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.