Consider boys as 1 and girls as 0.........
If there are 4 boys and girls....... Like
11110000
Subtract something so that u have to get 4 couples........ Like
10 10 10 10
If there are 4 boys and girls....... Like
11110000
Subtract something so that u have to get 4 couples........ Like
10 10 10 10
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1,008,990 is ur answer..
Let it be x...
Now 11110000-x=10101010
X=1,008,990
@skb