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28 March, 06:20

What is the 20th term of the following arithmetic sequence?

1/2, 1, 3/2, 2

+1
Answers (1)
  1. 28 March, 10:18
    0
    Hello:

    the common diffrence is : 2-3/2 = 3/2-1 = 1-1/2 = 1/2

    an = a1 + (n-1) d (general term) a1 = 1/2 d=1/2

    an = 1/2 + (n-1) (1/2) = 1/2n

    if n = 20 a20 = (1/2) (20) = 10
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