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Yuki888 [10]
3 years ago
8

Minnie has 4 different stamps. She needs 3 to mail a large letter. How many ways can she pick the 3 that will be used?

Mathematics
1 answer:
timurjin [86]3 years ago
7 0
Number of ways of picking a smaller number out of a bigger number is called combination.
Number of way of picking 3 stamps out of 4 is 4C3 (4 combination 3) = 4! / (3! x (4 - 3)!) = 4! / (3! x 1!) = (4 x 3 x 2 x 1) / (3 x 2 x 1 x 1) = 24 / 6 = 4 ways.
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Answer:

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<em>Additional comment</em>

The number of tickets sold at $16 will be ...

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