## 3. If the common difference of an AP is 3, then what is a18-a13

Question

3. If the common difference of an AP is 3, then what is a18-a13

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Mathematics
10 months
2021-07-19T04:49:58+00:00
2021-07-19T04:49:58+00:00 1 Answers
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## Answers ( )

Answer:Given, common difference of the AP,

d=5

We know that,

a

n

=a

1

+(n−1)d

Then,

a

18

=a

1

+17×d

a

13

=a

1

+12×d

Solving the two equations,

a

18

−a

13

=a

1

+17d−a

1

−12d

a

18

−a

13

=5d,

Substituting d=5,

a

18

−a

13= 25