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Let's see 2 cards to hit with 50 unknown.

Prob not hitting = Prob doesn't hit with card 1 and prob doesn't hit with card 2 and prob doesn't hit with card 3

= 48/50 * 47/49 * 46/48

= 88.24%

Prob hitting = 1 - prob not hitting

= 11.76%

Since the number of outs is so low you can approximate this with 2 (outs) * 3 cards to show / 50 cards unknown = 6/50 = 12%

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