Posted by **Jen** on Friday, July 29, 2011 at 10:41pm.

The cardinal number of the set {cat, dog, horse, fish, lizard, meerkat, rhinoceros, elephant, giraffe, platypus, hippopotamus, skunk} is ____.

I think its 12 right?

- Math -
**MathMate**, Friday, July 29, 2011 at 10:49pm
I usually call it cardinality.

It's right if you have the good reason for it. Can you explain?

- Math -
**Jen**, Friday, July 29, 2011 at 11:01pm
because its the amount in the {}

- Math -
**MathMate**, Friday, July 29, 2011 at 11:02pm
I suppose you mean "the number of elements in the set".

That would be correct.

- Math -
**Jen**, Friday, July 29, 2011 at 11:09pm
yes :) thanks

- Math :) -
**MathMate**, Friday, July 29, 2011 at 11:12pm
You're welcome!

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