Banned: Biting
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IP:
150 students tell the truth, while 50 students do not.
Students who tell the truth will answer "yes" to one favorite subject, whereas those not telling the truth will answer "yes" to two subjects (but not to their real favorite). Since there are 250 answers (104 + 86 + 60), there are 50 extra "yes" answers, from the 50 students who do not tell the truth.
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