My cheap way of thinking about it
There are 6 aces and kings that you don't have out of 50 cards. If you don't know your opponent's hands, aces and kings make up 0.12 of the remaining deck.
If you don know their hands, out of the next 18 cards (your opponents 9 hands), 2 aces and kings are gone. That means of the remaining 32 cards, there are 4 aces and kings left, or 0.125 of the deck.
Your chances of flopping a pair when 0.125 of the deck helps you should be better than when 0.12 of the deck helps you.
I like cheap math! No !Choose! for me.
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