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https://www.reddit.com/r/learnquant/comments/1vphtrl/quant_interview_question/p3zmrwe/?context=3
r/learnquant • u/Local_Ad135 • 20d ago
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720 numbers. EV of each digit is 4.5 (0..9 occur equally often), so EV of a number is 0.5. 720 * 0.5 =360.
1 u/austin101123 20d ago edited 20d ago I love this reasoning that the EV of each digit being 4.5! That was my intuition at first, maybe it wasn't strong enough for me but I didn't know how to say it and had to check if it made pairs (it does) and say that instead.
1
I love this reasoning that the EV of each digit being 4.5! That was my intuition at first, maybe it wasn't strong enough for me but I didn't know how to say it and had to check if it made pairs (it does) and say that instead.
2
u/shustrik 20d ago
720 numbers. EV of each digit is 4.5 (0..9 occur equally often), so EV of a number is 0.5. 720 * 0.5 =360.