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Martin Gardner's Mistake

Summary When Martin Gardner first presented the Two-Children Problem, he made a mistake in its solution. Later he corrected the error, but unfortunately the incorrect solution is more widely known than his correction. In fact, a Tuesday-Child variation of this problem went viral in 2010, and the same flaw keeps reappearing in proposed solutions of that problem too. In this article, we re-visit Martin Gardner's correction and discuss the new problem in detail.