285 viewsMath :: BasicMath :: Pre Algebra
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One day I called two friends and invited them to a party.

The next day, each of my two friends called and invited two more friends to the party.

The next day, each of the people who had been invited thus far called and invited two more friends to the party.

If this went on for fifteen days, how many people were actually called and invited to the party on the fifteenth day?

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