Brain Teasers
Perfect Groups
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
Which number in group 1 can also belong in group 2?
Group 1: 625, 144, 64, 225, 49, 9
Group 2: 8, 125, 729, 216, 27, 1000
Group 1: 625, 144, 64, 225, 49, 9
Group 2: 8, 125, 729, 216, 27, 1000
Answer
64 can also belong in group 2.In group 1, all the numbers are perfect squares: 625 [25*25], 144 [12*12], 64 [8*8], 225 [15*15], 49 [7*7], and 9 [3*3].
In group 2, all the numbers are perfect cubes: 8 [2*2*2], 125 [5*5*5], 729 [9*9*9], 216 [6*6*6], 27 [3*3*3], and 1000 [10*10*10].
64 is both a perfect square [8*8] and a perfect cube [4*4*4].
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