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Quiz 2 : Question 3 of 10
In an intercollegiate competition that lasted for 3 days, 100 students took part on day 1, 120 on day 2 and 140 on day 3. If 60 took part on day 1 and day 2 and 50 took part on day 2 and day 3 and 20 took part on all three days, how many students took part only on day 2?
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