# Mathematics, Science and English

**Discrete Mathematics**Level 3

*Mathematics, Science or English*. Each pupil *must* study at least *one of the three subjects*. Among a group of 40 pupils, 20 are studying Mathematics, 22 Science, 28 English; 12 are studying Maths and Science, 14 are studying Science and English and 15 are studying Mathematics and English. How many pupils are studying all **three** subjects?

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