allery50 વિદ્યાર્થીઓના એક જૂથમાં, 30 ને વાદળી રંગ ગમે છે, 25 ને લીલો રંગ ગમે છે અને 10 ને બેમાંથી એકપણ રંગ ગમતો નથી. બંને રંગ કેટલા વિદ્યાર્થીઓને ગમે છે?
A10
B15
C20
D25
Answer & Solution
Correct answer: B. 15
યોગ = 50 - 10 = 40. બંને રંગ ગમતા હોય તેવા = 30 + 25 - 40 = 15.
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