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If the number is an integer, then you cannot tell, but it does not matter: the decimal and other representations are the same.

If the number is not an integer, then a decimal will have a decimal point (a full stop) followed by one or more digits. A non-decimal will have a rational element (a/b) with some integers a and b, both non-zero)

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Q: How will you find whether a number is represented in decimal?
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