Brain Teasers
Groups of 3 in Groups of 5
Group
These brain teasers rely on your ability to recognize groups of common attributes. For each of these puzzles you'll need to figure out why the words or letters are grouped as they are. Sometimes you will be asked to pick the odd-one-out or to place a new word into the correct group.Group
In the set of numbers below, there is a set missing. Can you identify it?
3, 4, 5
5, 12, 13
8, 15, 17
9, 40, 41
Choose from:
2, 7, 8
5, 19, 23
7, 24, 25
10, 21, 24
11, 30, 31
3, 4, 5
5, 12, 13
8, 15, 17
9, 40, 41
Choose from:
2, 7, 8
5, 19, 23
7, 24, 25
10, 21, 24
11, 30, 31
Answer
7, 24, 25 is missing.The groups of numbers are "Pythagorean Triplets" (as in, the Theorem of Pythagoras).
3^2 + 4^2 (9 + 16) = 5^2 (25)
5^2 + 12^2 (25 + 144) = 13^2 (169)
7^2 + 24^2 (49 + 576) = 25^2 (625)
8^2 + 15^2 (64 + 225) = 17^2 (289)
9^2 + 40^2 (81 + 1600) = 41^2 (1681)
Hide Answer Show Answer
What Next?
View a Similar Brain Teaser...
If you become a registered user you can vote on this brain teaser, keep track of which ones you have seen, and even make your own.
Solve a Puzzle
Comments hidden to avoid spoilers.
Follow Braingle!