#2. How many different 10-digit numbers can I type by moving my finger like a knight in chess?
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You can form the numbers 5034927618 and 5038167294. You can also form their reverses: 8167294305 and 4927618305.
Hence four different numbers can be made.
The key point is to realize that the number must start or end on the ‘5’ key, followed/preceded by the ‘0’ key, otherwise, there is no way of using all ten keys during the route.
Continue reading for another riddle.
