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24 May, 11:47

Is the sequence 5,9,15 an arithmethic sequence explain?

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  1. 24 May, 11:58
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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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