hard · GMAT Quant
A set of 15 security cards are labeled with the prime numbers from 2 to 47. A card is 'Tier-1' if its number is less than 20 and 'Tier-2' otherwise.
If two cards are drawn at random without replacement, what is the probability that both are Tier-1?
- dfrac415
- dfrac815
- dfrac64225
- dfrac28225
- dfrac715
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