Six workmen are on a sinking barge and there are only four


Six workmen are on a sinking barge and there are only four life jackets. How many combinations of survivors are there?

A construction manager has four safety speeches, but will only have enough stage time to deliver three of them. Speeches presented in a different order constitute a different program. How many different speeches can be arranged?

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Basic Statistics: Six workmen are on a sinking barge and there are only four
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