Best short difficult riddles

funnytricky

Is an old 50 rupee note worth more than a new one?
Yes of course, 50 rupees are more valuable than 1 rupee.
73.41 %
63 votes
logicmath

What is the smallest number, that can be expressed as the sum of the cubes of two different sets of numbers?
Hardy-Ramanujan discovered 1729 as a magic number. Why 1729 is a magic number? 10^3 + 9^3 = 1729 and 12^3 + 1^3 = 1729 Taxicab number Ta(2)
73.31 %
85 votes