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8. We have looked at situations in which we need to determine the number of possible routes
between two places. We can look at the situation below as 9 steps, six of which must be East
and three of which must be South.
This gives us
possible routes.
The calculation
is equivalent to ,C3 (or ,(6).
Explain clearly why you could solve this question using combinations, and why this is equivalent
to considering permutations with repeated items.
4 marks

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