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In a class of 35 students, 10 speak Ilocano, 18 speak Bicolano, 16 speak Cebuano, 5 speaks both Bicolano and Ilocano, 2 speaks both Ilocano and Cebuano, 9 speaks both bicolano and cebuano, and 2 speaks all three languages.  How many students do not speak any of the 3 languages?

Sagot :

5 students do not speak neither of the three languages.
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