Find the Differences
Here is a fun puzzle, created by Hot Spring World. There are 8 differences between the pictures below. Can you find them all?
Archives: Community Posts
Puzzle Prime is tirelessly looking all around the internet to find the very best puzzles and bring them all to puzzleprime.com.
Creepy Beasties, Inc.
Halloween is coming up, so here’s a good logic puzzle. Can you determine who’s who based on the story I give below?
At Creepy Beasties, Inc., three of the most dreaded animals, a spider, a snake, and a rat, sat in their boardroom in silence while they awaited their boss. Then, Mr. Spider broke the silence.
“Isn’t it odd that our surnames match our species, yet none of our surnames match our own?”
The snake replied, “Yeah, but does anybody give a crap?”
They sat in silence again.
Number of Local Minimums
100 real random numbers between 0 and 1 are written in a row. What is the expected number of local minima in the row, i.e. numbers which do not stand next to a smaller number?
Five Heads, Five Tails
If you throw a fair coin 1000 times, what is the expected number of occurrences of 5 heads followed by 5 tails?
Ant on a Cube
Suppose there is an ant in one corner of a cube. Every second, the ant moves from one corner to an arbitrary neighboring one along one of the three available edges. What is the expected time until the ant comes back to the starting corner?
Throwing a Hundred Sided Dice
Two people are taking turns throwing a hundred sided die. The game continues until someone throws a number larger than the number thrown by the opponent on the previous turn. What is the probability that the person who throws first wins the game?
Example: 4 – 3 – 3 – 2 – 5 => First player wins
Example: 6 – 3 – 2 – 1 – 1 – 4 => Second player wins