Q7 of 38 Page 5

If the common difference of an AP is 5, then what is a18 - a13?

Given: d = 5


To find: a18 - a13


Formula Used: nth term of an AP is:


an = a + (n - 1) d


Explanation:


Given, the common difference of AP i.e., d = 5


Now,


As we know, nth term of an AP is


an = a + (n - 1) d


where a = first term


an is nth term


d is the common difference


a18 -a13 = a + 17d – (a + 12d)


= 5d


= 5(5)


= 25


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