I want to proof Can anyone help?
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Originally Posted by bram kierkels Clearly . is the number of ways to select items from a set of items. Let . Can you see the sum as selecting items from and items from ?
Originally Posted by Plato Clearly . is the number of ways to select items from a set of items. Let . Can you see the sum as selecting items from and items from ? I see what you mean. But shouldn't B have m elements? So that and becomes
Originally Posted by bram kierkels So that No that will not work, What happens if ? That gives an error in the summation.
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