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