The following real numbers have decimal expansions as given below. Classify them into rational and irrational.
a) 0.18181818…..
b) 3.252252225…..
c) 4.142857
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a) rational, because the decimal expansion is repeating and not terminating.
b) irrational, because decimal expansion is non-terminating and non-repeating
c)irrational, because decimal expansion is non-terminating and non-repeating
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