Based on the number of elements in A and the number of elements in B, the number of 1-1 functions is 0.
For 1 - 1 functions to be available from the elements, all elements in A have to be able to be mapped in B.
This means that there should be more elements in B than there are in A. For instance, if | A | = 12 than the B should at least be | B | = 12. This would allow all the elements in A to be mapped at least once in B.
As there are more elements in A than in B, it means that only 3 elements from A can be mapped onto B which leaves the other without being mapped. No function is therefore possible to be made.
In conclusion, the number of 1-1 functions that can be gotten from | A | = 6 and | B | = 3 is 0 functions.
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