allery100 विद्यार्थ्यांपैकी, 60 जणांना गणित आवडते, 50 जणांना विज्ञान आवडते आणि 40 जणांना दोन्ही विषय आवडतात. केवळ गणित आवडणारे किती विद्यार्थी आहेत?
A30
B20
C40
D60
Answer & Solution
Correct answer: B. 20
केवळ गणित = एकूण गणित - दोन्ही = 60 - 40 = 20.
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