15. How many combinations has a 3-digit lock? A. 27 B. 100 C. 300 D. 1000

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
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15. How many combinations has a 3-digit lock? A. 27 B. 100 C. 300 D. 1000 16. There are six questions on Eric's essay test. He only needs to answer 2 of them, you can choose any 2 that he wants. How many different combinations of two 2 test questions can Eric answer. A. 15 B. 30 C. 360 D. 120 17. If there are 250 two ways to select five players from tennis team. How many max players can a team make. A. 10 B. 20 C. 100 D. 200
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