Q2 Check the injectivity and surjectivity of the following functions
(i) f: N→N defined by f(x) = x2
(ii) f: Z →Z defined by f(x) = x2
(iii) f: R→R defined by f(x) = x2
(iv) f: N→Q defined by f(x) = x3
(v) f:Z →Z defined by f(x) = x3
(vi) f:R→R defined by f(x) = x3
Solution
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