CA CPT Dec 2015 Question Paper Quantitative Aptitude for online practice

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Question : 2 of 50

Marks: +1, -0

Which of these is a function from A→B
A= {x,y,z} B={a,b,c,d}

{(x,a) (x,b) (y,c)}
{(x,a) (x,b) (y,c) (z,d)}
{(x,a) (y,b) (z,d)}
{(a,x) (b,z) (c,y)}

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