Given below is a very interesting maths problem. This was set out by a German. It is not that difficult and solving it in less than a minute can help prevent Alzheimer disease. 2 + 2 + 2 = 6 3 3 3 = 6 4 4 4 = 6 5 5 5 = 6 6 6 6 = 6 7 7 7 = 6 8 8 8 = 6 9 9 9 = 6 1 1 1 = 6* Use any of mathematical signs wherever you need. Solving 1 line... You are Kindergarten graduate. Solved 3, high school graduate, Solved 5, University graduate, Solved all, PhD.. * solving this one you must be an emeritus. Go ahead and get your mind busy.