Answer :

**Given:** d = 5

**To find:** a_{18} - a_{13}

**Formula Used:** nth term of an AP is:

a_{n =} 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

a_{n =} a + (n - 1) d

where a = first term

a_{n} is nth term

d is the common difference

a_{18} -a_{13 =} a + 17d – (a + 12d)

= 5d

= 5(5)

= 25

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