Q. 225.0( 2 Votes )

Which term of the AP 21, 42, 63, 84, ... is 210?
A. 9th

B. 10th

C. 11th

D. 12th

Answer :

In the given AP, the first term = a = 21


Common difference = d = 42 - 21 = 21


To find: place of the term 210.


So, let an = 210


Since, we know that


an = a + (n - 1) × d


210 = 21 + (n - 1) × (21)


210 = 21 + 21n - 21


210 = 21n


n = 10


10th term of the AP is 210.

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