Rational number have no reciprocal?
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1 and -1 are the only rational numbers which are their own reciprocals. No other rational number is its own reciprocal. Therefore, rational number 0 has no reciprocal or multiplicative inverse.
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(i) 0 is the rational number, which does not have a reciprocal.
(ii) 1 and (–1) are the rational numbers, that are equal to their reciprocals.
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