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Problem 1 - Entrance Test

If a = 2, b = 3, c = 4, then what is the value of (a + b + c)/(ab + bc + ca) ?

Correct: B

Given a = 2, b = 3, c = 4. Put the values of a, b, c in (a + b + c)/(ab + bc + ca). (2 + 3 + 4)/(2*3 + 3*4 + 4*2) = 9/(6 + 12 + 8) = 9/26.