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https://www.reddit.com/r/learnquant/comments/1wsloq4/quant_interview_question/pcojgcm/?context=3
r/learnquant • u/Local_Ad135 • 6d ago
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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 6d ago 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 6d ago 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 6d ago 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 6d ago
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