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need help to understand the editorial of Shaass and Lights
By LimuInc, history, 9 years ago, In English

i ve tried to solve this problem 294C - Shaass and Lights but i can`t get the idea .... also after reading the editorial i cant understand

this formla 9!/(3!3!3!) . kindly if someone help me in understanding it .

thanks in advance and sorry for my bad English .
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9 years ago, # |
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you can have a look at this comment

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