Mathematics · Set Theory
15 व्यक्तियों के एक समूह में, 7 ने जर्मन पढ़ी है, 8 ने फ्रेंच पढ़ी है और 3 ने दोनों में से कोई भी भाषा नहीं पढ़ी है। इस समूह में कितने व्यक्तियों ने जर्मन और फ्रेंच दोनों पढ़ी हैं?
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