新GRE数学重要考点9

>>GRE数学考点：新GRE数学重要考点9

>>GRE考试精品课程训练

Example:

Number of possible ways to pick 4 oscar nominations from a list of 50 movies is 50!/(4!*(50-4)!)=50!/(4!*46!)=50*49*48*47/24=230300.

Remember:

This does not apply if there are identical objects.

Permutation of Objects

The number of ways n distinct objects can be ordered is n.

Example:

Number of ways 6 people can from a queue is 6.

Number of ways 5 different cars can be parked in 5 parking spaces is 5.

Remember:

This does not apply if there are identical objects or ordering does not matter.

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