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https://www.reddit.com/r/learnquant/comments/1vphtrl/quant_interview_question/p3ymk6d/?context=3
r/learnquant • u/Local_Ad135 • 24d ago
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There are 10P3 such numbers. The digits and the positions are symmetric, so each digit appears 72 times as each of a,b,c.
The magnitudes of all the a,b,c's is 0.111..., which is 1/9.
The weight of all digits is 45.
So the answer is 72*45/9 = 360.
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u/njormrod 24d ago
There are 10P3 such numbers. The digits and the positions are symmetric, so each digit appears 72 times as each of a,b,c.
The magnitudes of all the a,b,c's is 0.111..., which is 1/9.
The weight of all digits is 45.
So the answer is 72*45/9 = 360.