Question

if 3rd term of an AP is 9 and 9 term of same AP is 3 find 12 pls give answer fast​

Answer 1

Answer:

a3 = a+2d = 9...............(I)

a9 = a+8d = 3................(ii)

on subtracting (I) from (ii) , we get

6d = -6

=> d = -1

putting value of d , we get

a -2 = 9

=> a = 11

a12 = a + 11d = 11 + 11 (-1) = 11-11 = 0