Q. 95.0( 1 Vote )

Mark the correct A. one-one and onto

B. neither one-one nor onto

C. one-one not one-one

D. onto but not one-one

Answer :

Given that M is the set of all 2 × 2 matrices with entries from the set R of real numbers. Then the function f: M R defined by f(A) = |A| for every A ϵ M.


If f(a) =f(b)


|a| = |b|


But this does not mean that a=b.


So, f is not one-one.


As a ≠ b but |a|=|b|


So, f is onto.

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