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puzzle to puzzle you

Post  amazon on Fri Jan 16, 2009 9:47 am

a three digit lock has gone defective.....
if any two digit are correct you can be granted access
find the minimum no of trials that will make you get through the door

my guess is 10*10*10 !!!1 Twisted Evil

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Re: puzzle to puzzle you

Post  ankurgutpa on Fri Jan 16, 2009 2:24 pm

it should be 973.
explaination:
total ways 10*10*10
total ways by which 2 of the 3 digits are correct 3*(1*1*9) =27
total ways by which all 3 digits are correct=1
total ways for granting access=28
remaining failure ways=972
hence minimum trials required to get through the door is 973 cheers
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Re: puzzle to puzzle you

Post  VAIBHAV SINGHAL on Sun Feb 15, 2009 6:10 am

i think that will be maximum possible trials before solution..

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Re: puzzle to puzzle you

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