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In how many ways can three medals (gold, silver, and bronze) be awarded for a race involving nine runners?

Respuesta :

vietdung173

Answer:

Step-by-step explanation:

Every runners number 1 to 9

Every sequence from 1 to 9 like that

1,2,3,4,5,6,7,8,9 1,2,4,3,5,6,7,8,9 ...

The most number has the first place like 1 has the most is 9 times has the 1st place. We have a calculate for this

9+8+7+6+5+4+3+2+1=45 (ways)

I hope it'll help you much

Thank you for asking

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