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Write the digits 1 to 9 on index cards, ... |
2006-10-19 |
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Kim pose la question :
Write the digits 1 to 9 on index cards, arrange the cards to form three 3-digit numbers (using each card only ONCE). The third number is the sum of the first two numbers ** how many different ways can you do this?? **
Penny Nom lui répond. |
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