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Which of the above statements are true?

Flex your gray matter with by

You have invited 8 friends to your birthday party. You have asked the bakery to precut the cake into 9 pieces so that each person, including yourself, gets an equal amount of cake.

A few hours before the party, one of your friends informs you that he is not sure whether he will be able to come.

You call the bakery to change the number of pieces the cake should be precut into.

Find the minimum number of pieces the cake should be precut into, irrespective of the size of each piece, to ensure that each person gets an equal amount of cake irrespective of whether your friend comes or not.