How many set are in a cartisian product?
Example:

{(a),(b)}             = (ab)  Answer is 1
{(a),(b),(c)}         = (ab),(ac),(bc) answer is 3
{......,(c),(d)}      = (ab),(ac),(ad),(bc),(bd) answer is 5 

Let a=1, b=2, c=3, d=4.......

So if we have {1,2,......,50} How many set can we get?

very sinple the answer is 1225 sets.

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