If the 9th term of an ap is 1/7 and the 7th term os 1/9 find the 63rd term

= 1

Step-by-step explanation:

The n th term of an arithmetic progression is

= a + (n - 1)d

where a is the first term and d the common difference

use the 9 th term and 7 th term to find a and d

= a + 8d = → (1)

= a + 6d = → (2)

Subtract (2) from (1) term by term

2d = ⇒ d =

Substitute this value into (2) and solve for a

a + =

a = - =

Hence

= + = 1

it happens during combustion and impacts the environment because the plants and trees take in that and it can cause them to die.

-6 is the correct option from the above given options