# CBSE Class 10 Answered

**<div>common difference of an arithmetic progression is 3 and find a20 - a15</div>**

Asked by Kapil | 20 Oct, 2017, 09:59: AM

Expert Answer

We know that the common difference is given as '3'.

Let 'd' be the common difference, 'a' be the first term, so the nth term is written as

We will have to find

Applying the formula, the above expression becomes,

(a+19d) - (a+14d)

= a + 19d - a - 14d

= 5d

This finally becomes

5 x 3

=15

Answered by | 14 Dec, 2017, 05:13: PM

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