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10 October, 01:14

The geometric mean of 1 and a is 9. Find a.

The arithmetic mean of 1 and a is 9. Find a.

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  1. 10 October, 02:15
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    The arithmetic mean is the sum divided by the number of numbers.

    9 = (1 + a) / 2

    2*9 = 1 + a

    2*9 - 1 = a = 17

    The value of "a" is 17.
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