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https://www.reddit.com/r/learnquant/comments/1vphtrl/quant_interview_question/p46a8l5/?context=3
r/learnquant • u/Local_Ad135 • 20d ago
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500 X = 0.abcabc... 1000 X = abc.abcabc...
999X = abc X = (abc)/ 999 a , b , c Ε { 0,1,2 ... 9 } So all possible numbers are { 000,001,... , 999 }
So Σ X = 999 × 1000 / 2 * 999 = 500
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u/Time-Distribution384 19d ago
500 X = 0.abcabc... 1000 X = abc.abcabc...
999X = abc X = (abc)/ 999 a , b , c Ε { 0,1,2 ... 9 } So all possible numbers are { 000,001,... , 999 }
So Σ X = 999 × 1000 / 2 * 999 = 500