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Tim Gan Math

2000 A-Level H2 Mathematics

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Question 8Permutation and Combination

A ten-digit number is formed by writing down the digits $0,1,2,3,4,5,6,7,8,9$ in some order. No number is allowed to start with $0$. Find how many such numbers are odd.

Final Answer:

$1\,\,612\,\,800$