Positive integers are distinct from each other. Given that
Find the least value that can take.
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A perfect square is the product of some integer with itself.
In this case, let a = a 1 a 2 , where a 2 is the largest square dividing a . Likewise, let b = b 1 b 2 and c = c 1 c 2 . Since a b , b c , a c is a perfect square, a 1 = b 1 = c 1 = x for some value x in which a , b , c are not perfect squares. Therefore the smallest possible value of x must be 2 , and the smallest possible values for a 2 , b 2 , c 2 are 1 , 4 , 9 in some order.
Therefore we can conclude that
a + b + c = 2 × 1 + 2 × 4 + 2 × 9 = 2 8