Sunday, August 1, 2010

NMOS 2010 Q9

Q9. a, b, c and d are four distinct positive integers such that the product of any two of them is a multiple of 12. Find the least possible value of a+b+c+d.


2 x 6, 2 x 12, 2 x 18 --> 2 + 6 + 12 + 18 = 38

a + b + c + d = 38

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