Question

Find the 12th term of the A.P : 9, 13, 17, 21,.......​

Answer 1

Answer:

very simple

here a=8

D=5

and n =12

Step-by-step explanation:

therefore

a+n-1*d=

8+11*5

8+55=63

$therefore \: the \: 12th \: term \: is63$

Answer 2

Here, we are given :

First term ( a1 ) = 9.

Number of terms ( n ) = 12.

Common difference ( d ) = a2- a1.

= 13 - 9.

= 4.

And we need to find out the 12th term i.e. a12.

So, a12 = a + (n-1)d.

= 9 + (12 -1)4.

= 9 + (11 × 4).

= 9 + 44.

= 53.

So, the twelfth term of this AP is 53.

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