allery45 વિદ્યાર્થીઓના વર્ગમાં, 25 ઇતિહાસનો અભ્યાસ કરે છે, 20 ભૂગોળનો અભ્યાસ કરે છે અને 5 બેમાંથી એક પણ વિષયનો અભ્યાસ કરતા નથી. બંને વિષયોનો અભ્યાસ કરતા હોય તેવા કેટલા વિદ્યાર્થીઓ છે?
A15
B10
C5
D0
Answer & Solution
Correct answer: C. 5
યોગ = 45 - 5 = 40. બંને = 25 + 20 - 40 = 5.
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