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Problem of the Week
Problem A and Solution
Cupcake Caper

Mei Xing is having a party and is decorating 20 cupcakes for her friends. There is icing on all of the cupcakes, and she lines them up to add extra decorations.

  1. How many cupcakes have no extra decorations on them?

  2. Do any of the cupcakes get all three decorations? Justify your answer.