Question

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

Answer 1

$\mathtt{ \huge{ \fbox{Solution :)}}}$

Given ,

• Common difference (d) = 5

Let , the first term of an AP be " a "

We have to find $\large \mathtt{\fbox{ a_{18} - a_{13} }}$

Thus , by general formula of arithmetic progression

➡[a + (18 - 1)5] - [a + (13 - 1)5]

➡[17× 5] + [12 × 5]

➡85 - 60

➡25

Hence , the required value is 25

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