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26 November, 16:18

Is the sequence 5,9,15, ... an arthmetric sequence explain

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Answers (2)
  1. 26 November, 17:27
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    Is not because 9 - 5 = 4; 15 - 9 = 6; 4 is not equal with 6!
  2. 26 November, 19:42
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    If a, b, c is an arithmetic sequence then a + c = 2b

    a = 5, b = 9, c = 15

    subtitute

    a + c = 5 + 15 = 20

    2b = 2 · 9 = 18

    20 ≠ 18

    Answer: The sequence 5, 9, 15 is not an arithmetic sequence.
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