is 4.2 an irrational number?
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The number 4.2 is rational; it can be expressed as 4210. When we add 4.2 to the decimal expansion of √2 , we get: √2+4.2=1.414213562373095... It is easily seen that this sum also does not terminate nor have a repeating pattern, so it is also irrational.
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No, 4.2 is a rational number.
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