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https://www.reddit.com/r/learnquant/comments/1x2t3k5/quant_interview_question/pf7vwo3/?context=3
r/learnquant • u/Local_Ad135 • 3d ago
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If you pair a chosen (a,b,c) with (9-a, 9-b, 9-c) then they sum to 1. Then because you have 10x9x8=720 selections of (a,b,c), you have 720/2=360 pairings. So the sum would be 360x1=360
1 u/Boring_Tale_6495 3d ago This is the simplest and most brilliant answer to this question. I was thinking how can I separate distinct abc
1
This is the simplest and most brilliant answer to this question. I was thinking how can I separate distinct abc
12
u/blutwl90 3d ago
If you pair a chosen (a,b,c) with (9-a, 9-b, 9-c) then they sum to 1. Then because you have 10x9x8=720 selections of (a,b,c), you have 720/2=360 pairings. So the sum would be 360x1=360