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How many 3-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7 if repetition of digits is not allowed?
8 years ago

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new user
There are 7 choices for first digit, 6 for second and 5 for third digit. So, there can be 7x6x5=210 3-digit numbers.
8 years ago

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