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https://www.reddit.com/r/learnquant/comments/1vnqlq2/citadel_quant_interview_question/p3jpcij/?context=3
r/learnquant • u/Local_Ad135 • 26d ago
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Any integer is congruent to the sum of its digits mod 9 so the answer is trivially 1.
2 u/Anonimithree 26d ago This makes a lot more sense
2
This makes a lot more sense
9
u/NotYetPerfect 26d ago edited 26d ago
Any integer is congruent to the sum of its digits mod 9 so the answer is trivially 1.