1.

Let N be the set of all natural number , Z be the set of all integers and sigma : N to Zbe difinedby{:sigma(n)={((n)/(2)",",if,n" is even"),(,,"then"),(-(n-1)/(2)",",if,n" is odd"):}

Answer»

`SIGMA`is ONTO not ONE-one
`sigma`is one -one but not one
`SIGNA`is NEITHER one-one nor onto
`sigma`is one -one and onto

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