Question

Which term of the AP, 5, 9, 13, 17, ....... is 8 1​

Answer 1

Answer:

20 th term.

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Answer 2

Hey mate, here's your detailed solution-

Let us consider an(n th term)= 81

Now,

an = 81

a+(n-1)d =81

Here, d=4. and a=5

5+(n-1)4=81

4(n-1)=81-5

4n-4=76

4n=76-4

4n=72

n=

$\frac{72}{4}$

n=18

Therefore, it is the 18th term.