allery60 विद्यार्थ्यांच्या वर्गांत, 35 गणित आवडटा, 30 विज्ञान आवडटा, आनी 15 दोनूय आवडटा. कितल्यांक ONLY Math आवडटा?
A15
B20
C25
D30
Answer & Solution
Correct answer: B. 20
फकत गणित = n(गणित) - n(गणित ∩ विज्ञान) = 35 - 15 = 20.
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