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Random number generator

 
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I need to randomly generate x numbers from range 1 - 5 in a unique sequence.
For example:
x=20, within the set, i want to have 5 ones', 10 threes', and 2 twos', 1 fours', 2 fives' in a random sequence.
I know it is possible to achieve the about task by using a counter inside the loop. However, this is not the efficient way.
Can anyone help me out?
Thanks a lot!
 
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Don't know about efficient, but this seems to work OK.
 
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