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13 November, 04:36

4+8+12 + ... + 4n=2n (n+1)

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  1. 13 November, 05:22
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    4 + 8 + 12 + 4n = 2n (n + 1)

    24 + 4n = 2n (n) + 2n (1)

    24 + 4n = 2n² + 2n

    -2n - 2n

    24 = 2n²

    24 = 2n²

    2 2

    12 = n²

    √12 = n

    √4 * 3 = n

    √4 √3 = n

    2 √3 = n
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