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We're told there must be one carpenter and one mason. There are 7 carpenters to pick from for the first carpenter and 9 masons to pick from for the last mason.

The last place can be either a carpeneter or a mason.

Number of ways to pick carpenters = 6
Number of ways to pick mason = 8

[quote="ywilfred"]We're told there must be one carpenter and one mason. There are 7 carpenters to pick from for the first carpenter and 9 masons to pick from for the last mason.

The last place can be either a carpeneter or a mason.

Number of ways to pick carpenters = 6
Number of ways to pick mason = 8