Alina writes the numbers $1, 2, \dots, 9$ on separate cards, one number per card. She wishes to divide the cards into $3$ groups of $3$ cards so that the sum of the number in each group will be the same. In how many ways can this be done?
A. $0$
B. $1$
C. $2$
D. $3$
E. $4$

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Worked solution

Answer

C. $2$

AI analysis — may contain mistakes.

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