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
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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