HEREDITY
BASICS OF PROBABILITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A school has 5 entrance gates and 4 exit gates. In how many different ways can one enter and exit from the school?
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9
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12
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15
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20
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Explanation:
Detailed explanation-1: -There are a total of 4 + 4 + 4 + 4 + 4 = 20 ways. We could also arrive at the same answer by saying-there are 5 ways to enter AND 4 ways to leave. So, a total of 5 × 4 = 20 ways.
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