The Rubik’s cube is 40. 
It’s shocking (that it is that old), but I do remember that I was still in school when it first appeared. My younger brother could solve it in under 2 minutes .. while I never did get the hang of it ! Invented in 1974 by Hungarian mathematician Ernő Rubik, it is the world’s top-selling puzzle game, and widely considered to be the world’s best-selling toy. Google is celebrating the anniversary with a virtual Rubik’s cube on its home page (picture on the right; it takes a little imagination to see ‘Google’ written there!
And how many permutations of the cube color positions are there? 43 quintillion. The number is so large that the packaging simply says ‘billions’ of possible permutations.
