Yahoo Answers: Answers and Comments for How many surjective functions are there when mapping a nset to a kset? [Gender Studies]
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From teen
enUS
Tue, 11 Sep 2012 12:33:53 +0000
3
Yahoo Answers: Answers and Comments for How many surjective functions are there when mapping a nset to a kset? [Gender Studies]
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From CAustin: It's going to be kCn; you're taking a ...
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Tue, 11 Sep 2012 12:55:40 +0000
It's going to be kCn; you're taking a set of size n and choosing positions for them out of a set of size k. (That's n!/(k!*(nk)!), analytically.)
If you're trying to figure out the analytics of that combinatoric process for the first time, you can think of it as taking the elements from set n one by one, assigning them a mapping in set k, and then going to the next one until you run out of elements in set n. In this process, there are always k  i + 1 mapping possibilities for the element from set n where i is the iteration index of the process. Solve the resulting sigma expression and you come up with the normal kCn expression.

From NickoG: Wrong section much?
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Tue, 11 Sep 2012 12:45:12 +0000
Wrong section much?

From Anonymous: nset to the whatnow ?
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Tue, 11 Sep 2012 12:42:17 +0000
nset to the whatnow ?

From Anonymous: My favorite part of taking calculus has been f...
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Tue, 11 Sep 2012 12:36:33 +0000
My favorite part of taking calculus has been forgetting it.
I still use algebra fairly regularly in my adult life, but I have never found a practical application for calculus in any job or hobby I've had.