user314
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How many 4-digit odd numbers can be formed using the digits 0, 1, 2 and 3 only if the repetition of the digit is not allowed?
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The reason why the answer is (2)(2)(1)(2) is because First digit: Cannot be 0, so there are three remaining numbers 1,2,3. But you must reserve one number (1 or 3) for the last digit, so there are ...

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