Question: An inspector visits a school which offers 15 classes in period 1, 14 in period 2, 20 in period 3 and 11 in period 4.

An inspector visits a school which offers 15 classes in period 1, 14 in period 2, 20 in period 3 and 11 in period 4. She wants to visit one class. In how many ways could she do this

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