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March 27, 2017

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A ship carries exactly 10 different signal flags. If each possible combination and ordering of 4 of these flags connotes a specific message, how many signals can be
sent with these flags, taken 4 at a time?

  • MATH Prob. - ,

    If a flag can be used more than once in a signal, the number would be 10x10x10x10 = 10000

    If a flag can be used only once, the number is
    10x9x8x7 = 5040

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