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6 December, 15:43

Find 2 consecutive odd numbers given that difference between their resiprocal is 2/63

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  1. 6 December, 16:19
    0
    Consecutive odd numbers are 2n+1, 2n+3

    difference of reciprocals

    1 / (2n+1) - 1 / (2n+3) = 2/63

    ((2n+3) - (2n+3)) / (2n+1) (2n+3) = 2/63

    2 / (4n^2 + 8n + 3) = 2/63

    4n^2 + 8n + 3 = 63

    4n^2 + 8n - 60 = 0

    n^2 + 2n - 15 = 0

    (n + 5) (n - 3) = 0

    n = 3 (only positive)

    numbers are 2 (3) + 1=7 and 9
  2. 6 December, 16:23
    0
    Those odd numbers are nine and seven.
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