29 travellers meet in a hostel. Among them, 21 speak French, 11 speak Spanish an...
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29 travellers meet in a hostel. Among them, 21 speak French, 11 speak Spanish and 18 speak English. These counts include 9 travellers who speak Spanish and at least one of French and English. All the travellers speak at least one of the three languages and 1 of the travellers speaks all three. How many travellers speak French and English (including those who speak all three languages)?
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