Q. 25.0( 5 Votes )

If the common dif

Answer :

Let the first term of AP be ‘a’ and common difference be ‘d’.


We know, General term of an A.P is given by


an = a + (n – 1)d


Here d = 3


a20 = a + (20 – 1)d


= a + 19d


a15 = a + (15 – 1)d


= a + 14d


a20 – a15 = a + 19d – a – 14d


= 5d = 15


Hence, option C is correct.

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