Question 26
In the adjoining figure, the lines represent one-way roads allowing travel only northwards or only westwards. Along how many distinct routes can a car reach point B from point A?
Solution
The person has to take 3 steps north and 4 steps west, in whatever way he travels.
Total steps = 7, 3 north and 4 west.
Number of ways = 7!/(4!3!) = 35
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