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common difference of an arithmetic progression is 3 and find a20 - a15

Asked by Kapil 20th October 2017, 9:59 AM
Answered by 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 Expert 14th December 2017, 5:13 PM
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