There are 7 boys and 8 girls in a class. A teacher has 3 items viz a pen, a pencil and an eraser, each 5 in number. He distributes the items, one to each student. What is the probability that a boy selected at random has either a pencil or an eraser?

Question

Vivek Gorrepati · Accepted Answer

total no. of cases is 15*15 = 225.
No.of cases that one particular boy gets eraser = 5
No.of cases that one particular boy gets pencil = 5
therefore ans is 10/225

shivam Agrawal · Answer

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There are 7 boys and 8 girls in a class. A teacher has 3 items viz a pen, a pencil and an eraser, each 5 in number. He distributes the items, one to each student. What is the probability that a boy selected at random has either a pencil or an eraser?