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Posted by on Thursday, September 13, 2012 at 7:47pm.

I am lost, need to know how to do these types of problems.
How many one-to-one correspondences are there between the sets {a,b,c,d}and{1,2,3,4}if in each correspondence
A. a and c must correspond to even numbers
B. b must correspond to 3?
C. b must correspond to 3 and d to 4?

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