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)
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Comments
Had me stumped mate. Cool teaser.
i found this one rather easy, and i am only 14. is that ok?
calmsavior - algebra is probably fresh in your mind, so you recognized the pattern quickly! for the rest of us, it takes a minute.
I immediately knew it based on the 3,4,5 - that's the most popular one taught. But still, fun teaser
I cannot believe I missed this one...
im a decent math kid, so this one was cake, the 3.4.5 clued me in and the others, i happen to just know offhand... good though
I saw the 5,12,13 and remembered that... Nice teaser!
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