Question

Find the 11 term of the AP 15, 12, 9,​

Answer 1

Answer:

Given AP 15 , 12 , 9 , ........ We have to find 11th term. We have formula for term. Thus 11th term is -15.

Answer 2

$a = 15 \: \: \: d = 12 - 15 = - 3 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: d = 9 - 12 = - 3 \\ {a}^{11} = 15 + (11 - 1) - 3 \\ = 15 + (10)( - 3) \\ = 15 - 30 \\ = - 15$