Question

Find the 20 th term of AP 3,6,9,12

Answer 1

Answer:

A=3

N=20

D=3

A20= A+(N-1)D

      = 3+(19)3

      = 60

Step-by-step explanation:

Answer 2

$AP:3,6,9,12....\\a=3\\d=6-3=3\\n=20\\a_n=?\\a_n=a+(20-1)d\\a_n=3+(20-1)3\\a_n=3+(19*3)\\a_n=3+57\\a_n=60$