CBSE Class 10 Answered
common difference of an arithmetic progression is 3 and find a20 - a15
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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