17-11-2017
Mathematics

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There are 20 people in Susan’s class. Each person gives a card to everyone else in the class. How many cards were exchanged?

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bgrindle01 bgrindle01

17-11-2017

each student will give 19 cards so 20x19=380

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dannielle dannielle

17-11-2017

Every person in the class gives 19 cards
⇒20*19=380 card were exchanged

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