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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