Question

Which term of the the ap 3.10.17 will be 84 more than its 13 th term

Answer 1

Answer:

Step-by-step explanation:

Here a = 3

d =10 - 3 =7

Now a13 = a + 12d

a13 = 3 + 12 × 7

a13 = 87

We need to find n for the term which is 84 more than a13

That is we need to find n for

an = 87 + 84

an = 171

an = a + (n-1)d

171 =3 +(n-1)×7

171 = 3 + 7n - 7

7n = 171 + 4

7n = 175

n =175/7

=25

Ans 25th term

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