Every night, Jon and his brothers randomly determine the

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Every night, Jon and his brothers randomly determine the schedule in which they will get to use the shower in the morning. How many distinct schedules are possible?

(1) The probability that Jon will be first or last is 40%.

(2) There are 48 ways Jon could be first or last.

[spoiler]OA=D[/spoiler]

Source: Princeton Review
Source: — Data Sufficiency |