If A=(a,b,c,d) and B=(x,y,z) then the number of injectionappings from A to B is?

or:If A=(a,b,c,d) and B=(x,y,z) then the number of injectionappings from A to B is?

or:If A=(a,b,c,d) and B=(x,y,z) then the number of injectionappings from A to B is?

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