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Natural number - IB-math A-level SAT GMAT GRE online help in microeconomics macroeconomic analysis. Hardest GMAT Problem Solving Questions How many even 3 digit integers greater than 700 with GMAT Combinations McKinsey Problem Solving Test. Set theorists often denote the set of all natural numbers by a lower-case Greek letter omega. When this notation is used, zero is explicitly included as a natural number. What is natural number? - Definition from yo