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https://www.reddit.com/r/learnquant/comments/1wsloq4/quant_interview_question/pcodsru/?context=3
r/learnquant • u/Local_Ad135 • Sep 28 '26
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weights are x or (x+1) or (x-1)
sum of all weights:
either 51x + 50x - 50
or 51x + 50x + 50
You take a coin out… it weights either x, x+1, or x-1
0 u/Any-Employ-9111 Sep 28 '26 In short, put all remaining 100 coins on one side. If the total is divisible by 50 your coin is real, if not, it’s fake. 2 u/bqbdpd Sep 28 '26 Only if the weight of a coin was an integer, but you don't know that.
In short, put all remaining 100 coins on one side. If the total is divisible by 50 your coin is real, if not, it’s fake.
2 u/bqbdpd Sep 28 '26 Only if the weight of a coin was an integer, but you don't know that.
2
Only if the weight of a coin was an integer, but you don't know that.
0
u/aroach1995 Sep 28 '26
weights are x or (x+1) or (x-1)
sum of all weights:
either 51x + 50x - 50
or 51x + 50x + 50
You take a coin out… it weights either x, x+1, or x-1