“Typically, when the worlds of math and sports collide, name calling, noogies and maybe even a wedgie follow. But that was not the case Thursday night at the National Museum of Mathematics in Manhattan, where 50 would-be mathematicians huddled in a windowless classroom to harness the power of linear algebra and complex computer codes to predict the outcome of each of the 67 games in the N.C.A.A. men’s basketball tournament.”