Question 242497
If D = {w, h, y} and E = {n, o, t}then answer the following: 
(a)How many possible one-to-one correspondences are there between sets D and E? 
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With w you can associate 3 letters
With h you can associate 2 letters
With y you can associate 1 letter.
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# of one-to-one is 3*2*1 = 6
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Cheers,
Stan H.