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II-B Combo

 
 
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II-B Combo
by Kevin Song - Sunday, 23 January 2022, 8:46 AM
 

Hi, I am confused about what 6.25 is asking. Am I supposed to prove that the coefficient of a1^k1 a2^k2... an^kn is n!/(k1! k2! k3! ... kn!)?