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23 May, 00:28

If the first term of an arithmetic sequence is 4 and the third term is 18, what is the 23rd term?

A. 92

B. 116

C. 158

D. 161

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Answers (1)
  1. 23 May, 03:16
    0
    C. 158

    1. term 2. term 3. term 4. term 5. term

    4 4 + d 18=4+d+d 18 + d 18 + d + d

    14=2d

    7=d

    The equation: 4 + 7 (k - 1)

    First term: 4 = 4 + 7 (1 - 1) = 4

    Third term: 18 = 4 + 7 (3 - 1) = 18

    23. term: 4 + 7. (23 - 1) = 4 + 7.22 = 158
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