SOLUTION: in how many ways can a committee of 7 be formed if there are 10 dogs and 15 cats to choose from and the committee must consist of at least one cat?

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Question 356644: in how many ways can a committee of 7 be formed if there are 10 dogs and 15 cats to choose from and the committee must consist of at least one cat?
Answer by stanbon(57967) About Me  (Show Source):
You can put this solution on YOUR website!
in how many ways can a committee of 7 be formed if there are 10 dogs and 15 cats to choose from and the committee must consist of at least one cat?
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# of committees with no cats: 10C7
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# of committees with no restrictions: 25C7
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# of committees with at least one cat:
25C7 - 10C7 = 480,580
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Cheers,
Stan H.