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The probabilities of a student getting first class or second class or third class in an examination are (2)/(7) , (3)/(5) ,(1)/(10) respectively . The probability that the students fails is .

In a class there are 12 boys and 7 girls. The teacher wants to select either a boy or a girl to represent the class in a competition. In how many ways can the teacher make this selection.

The teacher tells the class that the highest marks obtained by a student in her class is twice the lowest marks plus 7. The highest mark is 97. What is the lowest mark?

The given chart shows the number of students in Class 4, Class 5, Class 6 and Class 7 who got first class, second class and failed in the final examination. दिए गए आरेख कक्षा 4, कक्षा 5, कक्षा 6 और कक्षा 7 में उन छात्रों की संख्या को दशशाते हैं, जिन्होंने अंतिम परीक्षा में प्रथम श्रेणी, द्वितीय श्रेणी प्राप्त किया और जो असफल रहे। Which class has the highest number of students who passed? किस कक्षा में उत्तीर्ण होने वाले छात्रों की संख्या सबसे अधिक है?