Statistics & Probability Question - Can Someone Please Help?

Posted on 2016-04-14 18:44:00 in Statistics by GERGE

A box contains 07 flags each of different colour. A signal is made by flying 03 flags on a vertical flagpole. 

(a) How many different signals can be made? (Note that a signal depends on the order of the flags as well as their colour) 

(b) When a signal is flying, how many different combinations of flags could be left in the box? 

If anyone could please help, I'd be very grateful. 

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