# VAHID

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## Community Reputation

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• Rank
Junior Member

## VAHID's Activity

1. VAHID added a topic in New Logic/Math Puzzles

A picture hidden in behind.
what do you see?

• 9 replies
• 786 views
2. VAHID added a post in a topic

amazing text!!
Thanks
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3. VAHID added a topic in New Logic/Math Puzzles

If 'n' people are going to buy tickets in a ticket shop that is open for 'n' minutes, how long will the maximum queue time be, given that they arrive randomly within the time scope?

• 2 replies
• 104 views
4. 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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5. VAHID added a post in a topic

1158
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6. VAHID added a topic in New Logic/Math Puzzles

• 6 replies
• 478 views
7. VAHID added a post in a topic

zero
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8. VAHID added a post in a topic

tnx
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9. VAHID added a post in a topic

now, it's true
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10. 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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11. 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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12. VAHID added a post in a topic

i write a program for n=2
we have 10000 state and just 163 unique number exist!
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13. VAHID added a post in a topic

14. VAHID added a post in a topic

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