Brain Teasers
4 Numbers
There is a combination lock with four inputs 0-9. Can you figure it out?
The second isn't a 6.
Only one digit starts with a vowel.
The fourth is greater than the first, is greater than or equal to the third, and is greater than the second.
Either the first two numbers are even & the last two numbers are odd or vice versa.
The difference between the 1st & 2nd is the same as the difference between the 4th & 3rd (order matters).
One of the numbers is prime; three are composite.
The second isn't a 6.
Only one digit starts with a vowel.
The fourth is greater than the first, is greater than or equal to the third, and is greater than the second.
Either the first two numbers are even & the last two numbers are odd or vice versa.
The difference between the 1st & 2nd is the same as the difference between the 4th & 3rd (order matters).
One of the numbers is prime; three are composite.
Hint
1 & 0 are neither prime nor composite & there is no 2.Answer
8, 4, 5, 9Hide Hint Show Hint Hide Answer Show Answer
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Comments
This is a terrific logic puzzle. It does require a bit of knowledge of mathematics to properly understand prime numbers. The logic is direct and deductive, but not explicitly obvious.
I am so glad that I came looking for Rove's teasers after liking another of their recent submissions. I may never have found this one otherwise.
Beautifally crafted.
I am so glad that I came looking for Rove's teasers after liking another of their recent submissions. I may never have found this one otherwise.
Beautifally crafted.
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