Sum of 6 numbers a+b+c+d+e+f = 21 from the set{1,3,5,9}.
Condition is Each no can be used max 4 times....that means u
have 1,1,1,1 ; 3,3,3,3 ; 5,5,5,5 ; 9,9,9,9
From these 16 numbers find combination 6 numbers which
equals to 21.
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