Question

What will be the seventh term of 3,6,9.12
(a) 10.b 15 (C) 18 (d) 20
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Answer 1

Answer:

18

Explanation:

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Answer 2

$\huge\sf\underline\orange{Solution}$

Given 3,6,9,12......

It is In AP Because Common difference is same

6 - 3 = 3

9 - 6 = 3

12 - 9 = 3

Hence common difference is d = 3

So, first term (a) is 3

Therefore a =3 d = 3 n =7

We have to find 7th term t7

We know one formula

an = a+(n-1)d

a7 = 3 +(7-1)3

a7 = 3+6(3)

a7 = 3 + 18

a7 = 21

So, 7th term of given sequence is 21

(or)

Given

3,6,9,12 Its difference is 3 So, The sequence will continue like this

3,6,9,12,15,18,21,24.....

In that 7th term is 21 So answer is 21