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by sujaysolanki » Thu Dec 06, 2007 7:58 am
et x be the sum of the other 20 numbers
n=4*x/20=x/5

the sum of 21 numbers is x/5+x=6x/5

n / sum of 21 numbers is:
(x/5)/(6x/5)=5x/30x=1/6
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