1.

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

Answer»

Given: AP is 9, 13, 17, 21, ……

Here, first term = a = 9

Common difference = d = 13 – 9 = 4

an = a + (n-1)d

a20= 9 + (20-1)4

= 85



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