by bboggs on February 3rd, 2010

bboggs

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how many different 4-digit numbers can be made using 8641?

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  • by Ringo on February 3rd, 2010

    Ringo

    The first number (the thousands slot) can be one of 4 numbers, 8, 6, 4, or 1.
    The hundreds slot then has one of three number left over.
    Next the tens position has one of 2 numbers to choose from.
    The ones position has what's left.

    The solution is 4 factorial or 4!. 4 X 3 X 2 X 1 = 24 separate 4 digit numbers.

    Hope this helps.

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  • by Rawwr on February 3rd, 2010

    Rawwr

    1.)8641
    2.)8614
    3.)6841
    4.)6814
    5.)8416
    6.)8461
    7.)4861
    8.)4816
    9.)4618
    10.)4681
    11.)4168
    12.)4186
    13.)1468
    14.)1486
    15.)1864
    16.)1846
    17.)1648
    18.)1684
    19.)6418
    20.)6481

    well thats all i can think of right now(20 pairs). If I had the right amount of time it wouldnt be difficult to pair these different sollutions.

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