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The rational number can be expressed as a fraction, while the irrational number cannot be expressed as a fraction and has a non-repeating decimal expansion.
Out of the options provided:
a) 52.781654292 can be expressed as a rational number.
b) -7 8/37 can be expressed as a rational number.
c) 3.636363636363... is a repeating decimal, so it can be expressed as a rational number.
None of the options listed are irrational numbers.