allery60 विद्यार्थ्यांच्या एका वर्गात, 35 जणांना गणित आवडते, 30 जणांना विज्ञान आवडते आणि 15 जणांना दोन्ही विषय आवडतात. फक्त गणित आवडणारे किती विद्यार्थी आहेत?
A15
B20
C25
D30
Answer & Solution
Correct answer: B. 20
फक्त गणित = n(Math) - n(Math ∩ Science) = 35 - 15 = 20.
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