Question

which term of an AP : 3,10,17.... will be 84 more than its 13th term

Answer 1

the answer is 25th term

Answer 2

Hey

Here is your answer,

a = 3
d = 7 ,

13th term will be ,

a13 = a + 12d
a13 = 3 + 12×7
a13 = 3+ 84 = 87

Since , 84 more than its 13th term ,so ,value of term will be =
87 + 84 = 171
So value of term is 171

Now using ,

an = a+(n-1)d
171 = 3 + 7n - 7
171 + 4 = 7n
175/7 = n
N = 25 ,

So 25th term will be 84 more than its 13th term

Hope it helps you!