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A student may fail mathematics because he/she did not study, did not attend class, or did not understand the lesson material.
5+10+10 5+5+5+10 5+5+5+5+5 5+20 Four ways.
A student may fail mathematics because he/she did not study, did not attend class, or did not understand the lesson material.
there are 5 ways
The number of ways is 18C5 = 18!/(5!*13!) = 8,568 ways.