Question

if in an A.P., T7 = 18 , T18 = 7, find T101

Answer 1

when we will find value of ‛a’ we are to write 18+6=24
by mistake i wrote it 16.
then. we will get a=24
then you continue. you r to change the value of a only.
hope u got it. dont forget to like . i will help you in other sums.

Answer 2

Answer:

Step-by-step explanation:

a+6d=18__1

a+17d=7

Therefore -11d=11

Therefore d= -1

Put it's value in __1

So, a+6(-1) =18

Therefore a-6=18

a = 24

Now, an = a+(n-1) d

= 24 + 100(-1)

= 24 - 100

= -76