Question

Find the 31st term of an AP whose 20th term is -102 and 35th terms -192​

Answer 1

Answer:

let 20 term

a+19d=-102

and 35th term

a+34d=-192

subtract 1 by 2

15d=-90

d=-6

and put d find a=12

31st term=a + 30d

now 12+30×-6=-168