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Question

what is a20- a15 , if the common difference of an AP is 3 ?

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Solution

Given: d = 3
​a
20 - a15=?

(a + 19d) - (a + 14d) = a + 19d - a - 14d
​ = 19d - 14d
= 5d
= 5(3)
= 15 (answer)

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