VAHID
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VAHID added a topic in New Logic/Math Puzzles

VAHID added a post in a topic
amazing text!!
Thanks

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VAHID added a topic in New Logic/Math Puzzles

VAHID added a post in a topic Spinning Sihouette Optical Illusion
what is the spinning direction of middle girl (right or left)?

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VAHID added a post in a topic
1158

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VAHID added a topic in New Logic/Math Puzzles

VAHID added a post in a topic
zero

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VAHID added a post in a topic
tnx

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VAHID added a post in a topic
now, it's true

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VAHID added a post in a topic
my program is correct with 4 digit , my condition (x>999) reject all number lower than 999 so zero is not a problem
about n=5, 10 ,20,... , i think, first we must solve problem with 4 digit (n=2) then other sample will be solved.
my program said: 20250 and you said 9000!

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VAHID added a post in a topic
we can creat 9999 number for n=4
i write this program with matlab for n=4
sum=0;
for i1=0:9
for i2=0:9
for i3=0:9
for i4=0:9
x=i1*1000+i2*100+i3*10+i4;
if x>999
sum=sum+(det([i1 i2 ;i3 i4]);
end
end
end
end
end
sum
this program generate all number with n=4 (x>999)
calculate sum of determinate of this number , answer is: 20250
i think you question have a bug , please send the source question (you siad : I found this puzzles at a site)

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VAHID added a post in a topic
please give us another example,
i write a program for n=2
we have 10000 state and just 163 unique number exist!

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VAHID added a post in a topic
E={1,3,7,9}
H+((2*E)/10)+10=R
....
very hard!

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VAHID added a post in a topic
answer is 7
because
2 seconds to 2
and 5 seconds to 3

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