Question

a rational number which does not have multiplicative inverse is​

Answer 1

your answer:- 1 and -1

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Answer 2

Answer:

0/1 , its multiplicative inverse will be 1/0 which is not defined thus it is not possible to find the multiplicative inverse of 0/1

also this can be said for any number of this form like 0/2,0/3,0/7, etc