A railway has 20 stations a one-way trip involves travel


A railway has 20 stations. A one-way trip involves travel from any one station to any different station.

(a) How many different kinds of one-way trip tickets must be printed if each ticket identi?es the departure station and also the destination?

(b) How many different kinds of one-way trip tickets are needed if each ticket says only "for travel between" one station and another, and may be used in either direction between the two stations

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Basic Statistics: A railway has 20 stations a one-way trip involves travel
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