common difference of an arithmetic progression is 3 and find a20 - a15
Asked by Kapil | 20th 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 | 14th Dec, 2017, 05:13: PM
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