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Question: a three digit number is to be formed using the...

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A three digit number is to be formed using the digits from the set (1, 2, 3, 4, 5, 6, 7, 8). How many such numbers are possible if the digits can be repeated but the digit 1 must appear at least once? Hint: (The number with no 1s) + (The number with at least one 1) Total number of three digit numbers]
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