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Question

The streets in a city are arranged like the lines of a chess-board. There are six streets running north and south, and five streets running along east-west. Find the number of ways in which a man can travel from the north-west to the south-east corner, going the shortest possible distance.

A
231
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B
462
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C
683
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D
900
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Solution

The correct option is A 462
12 3 4 5
2
3
4
If going by shortest route,
Total horizontal steps required =5
Total vertical steps downward =6
Total number of ways of arranging 5H and 6V steps = 11P6=462

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