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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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Answer» `Mean = (9+99+999+....+999999999)/9``= 9((1+11+111+...+111111111))/9` `=1+11+111+...+111111111` As we know, `1+11=12` `1+11+111=123` Similarly, `1+11+111+1111+....+111111111=123456789=N` Therefore, it does not contain `0` which is the correct answer. |
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