Question

Find the 21 term of the Ap -4 1/2, -3, -1 1/2

Answer 1

Answer:

25 1/2.

Step-by-step explanation:

nth term = a1 + d(n - 1)

Here, a1 = -4 1/2

d  = -1 1/2-(-3)

   = -1 1/2 + 3

   =  1 1/2

So,

21st term = -4 1/2 + 1 1/2(21 - 1)

               = -4 1/2 + 1 1/2 * 20

               = -4 1/2 + 30

                = 25 1/2.