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Vedmedyk [2.9K]
3 years ago
13

HELP ASAP

Mathematics
1 answer:
devlian [24]3 years ago
4 0

Answer:

6x-y+7x-7y

6x+7x-y-7y

13x-8y.

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Answer:

6 swimmers in the first heat can be arranged in 1716 different ways.

Step-by-step explanation:

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= ^{13}C_{6}

= \frac{13!}{(6!)(13-6)!}

= \frac{13\times 12\times 11\times 10\times 9\times 8\times 7!}{6!\times 7!}

= \frac{13\times 12\times 11\times 10\times 9\times 8}{6\times 5\times 4\times 3\times 2\times 1}

= \frac{1235520}{720}

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