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    jasontips's Avatar
    jasontips Posts: 2, Reputation: 1
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    #1

    Nov 13, 2009, 05:11 PM
    4 digit combination
    In a four digit code numbers 0-9, what are all the possible different combinations of numbers. Assume the numbers can be used twice
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Nov 14, 2009, 05:28 AM
    There are 10 digits from 0 to 9. If repetition is allowed, then we have

    10*10*10*10=10,000 possibilities. Think about it. How many 4 digit numbers are there from 0000 to 9999? There are 10,000.

    Now, if repetition is NOT allowed, then we have 10 choices for the first, 9 for the second, 8 for the third, 7 for the fourth.

    10*9*8*7=7!=5040.

    Now, with these as an idea, how many are there with a number used twice?
    jasontips's Avatar
    jasontips Posts: 2, Reputation: 1
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    #3

    Nov 18, 2009, 11:35 AM

    HEY GALACTUS, is there anywhere I can get all of those different combinations? AND YES, any number can be used more than once.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #4

    Nov 18, 2009, 12:12 PM
    All 10,000? Think about it. Those 10,000 combinations would be all the numbers from 0000 to 9,999. Just count to 10000
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