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10 March, 21:21

How many four digit numbers may be formed using the elements from the set {1, 2, 3, 4, 5, 6, 7} if no elements can be repeated in the number?

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  1. 10 March, 21:45
    0
    1st digit and 2nd digit and 3rd digit and 4th digit (with no repeats)

    7 x 6 x 5 x 4

    7 x 6 x 5 x 4 = 840

    Answer: 840 four-digit numbers
  2. 11 March, 00:56
    0
    32 elements are formed
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