The arithmetic mean of the nine numbers in the given set {9, 99, 999, ....... 999999999} is a 9 digit number N, all whose digits are distinct. The number N does not contain the digit

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Solution

$N = \frac{1}{9}$ {9, 99, 999, ....... 999999999} = 1 + 11 + 111 + .......+111111111
= 1 2 3 4 5 6 7 8 9 (A)

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