Prop bet and a math ?

[AngusThermopyle]

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find the probability of not hitting one of the three cards and subtract from one.

1-[(43/52)*(42/51)*(41/50)] = .441 = 44.1%

in other words, more likely that a Q, 7 or 2 will come on flop than not.

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But what about a K, 8, or 5? I have heard that is a better prop.

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A, K, or Q is the worst prop. Players stop and think "How often does one of those hit the flop when I have JJ?" and refuse the prop.