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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 straight a subscript straight n equals straight a plus left parenthesis straight n minus 1 right parenthesis straight d
 
We will have to find straight a subscript 20 minus space straight a subscript 15
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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