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Math Help - please please help me with this one

  1. #1
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    please please help me with this one

    I have 7 different signal cards that I can flash 5 at a time. How many different signals can I make
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  2. #2
    GAMMA Mathematics
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    Quote Originally Posted by Help09 View Post
    I have 7 different signal cards that I can flash 5 at a time. How many different signals can I make
    Does order matter? If it doesn't, then this is a combination.

    7 \choose 5  = \frac{7!}{5!2!} \Rightarrow 21
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