Question

a,a+d,a+2d,...l are n terms of an AP .find [n-1]th term of it in term of l.

Answer 1

an = a+(n-1)d. , ...a(n-1) =a+(n-2)d....
so...on....

Answer 2

Answer:

The [n-1]th term of it in term of l is I-d.

Step-by-step explanation:

It is given that a,a+d,a+2d,...l are n terms of an AP.

Here first term is a and common difference is d.

The nth term of an AP is

$a_n=a+(n-1)d$

The (n-1)th term of an AP is

$a_{n-1}=a+(n-1-1)d$

$a_{n-1}=a+(n-1)d-d$

$a_{n-1}=a_n-d$

In the given AP the nth term of the AP is I.

$a_{n-1}=I-d$

Therefore the [n-1]th term of it in term of l is I-d.