Given 5 flags of different colours, how many different signals can be generated if
each signal requires the use of 2 flags, one below the other?
A coin is tossed 3 times and the outcomes are recorded. How many possible
outcomes are there?
How many 5-digit telephone numbers can be constructed using the digits 0 to 9 if
each number starts with 67 and no digit appears more than once?
How many 4-letter code can be formed using the first 10 letters of the English
alphabet, if no letter can be repeated?
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