[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 565
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and once again the Belarus team is pulling away!
How to identify a counterfeit coin (it is lighter than the others) out of eight. Using a cup scale and two weighings. ?
who knows, do not write. the way others will be interested to find the answer.
How to identify a counterfeit coin (it is lighter than the others) out of eight. Using a cup scale and two weighings. ?
who knows, don't write. the way others will be interested to find the answer.
Mathematicians have found a system for winning at roulette
How to identify a counterfeit coin (it is lighter than the others) out of eight. Using a cup scale and two weighings. ?
who knows, don't write. the way others will be interested to find the answer.
I know exactly how to determine whether Ukrainian hryvnias are half-denominated:
1. put the note on the table
2. take a piece of lard
3. trace the banknote around the edge
if the portrait on the banknote accompanies the lard with a look - the banknote is real!
Mathematicians have found a system for winning at roulette
Is it possible to make a bet after the roulette wheel has been unwound and the ball has been thrown in? What's the use of this analysis.
I saw a movie on the subject, the croupier was trained to throw the ball and his friends would come in and win.
How to identify a counterfeit coin (it is lighter than the others) out of eight. Using a cup scale and two weighings. ?
1st weighing on different bowls of 3 coins each:
a) if the weight is the same, the false coin is one of the 2 remaining coins, make a 2nd weighing of the 2 remaining coins-->answer--the false coin is the lighter one;
b) if the weights are different, take the light cup with three coins, make a second weighing. On different bowls of 1 coin (out of 3):
1.b)if the weight is the same, the answer--the counterfeit coin is the one that was not weighed;
2.b)if the weight is different, the answer is-- the counterfeit coin is the lighter one.