Question
In a certain test there are questions. In this test students gave wrong answer to at least questions, where . If the total number of wrong answers is the value of is
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Text solutionVerified
The number of students answering at least r questions incorrectly is
Thus the number of students answering exactly r question incorrectly is .
Also, the total number of wrong answers is
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Question 1
The number of numbers less than 1000 that can be formed out of the digits 0, 1, 2, 4 and 5, no digit being repeated, is Stuck on the question or explanation?
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Question Text | In a certain test there are questions. In this test students gave wrong answer to at least questions, where . If the total number of wrong answers is the value of is |
Answer Type | Text solution:1 |
Upvotes | 150 |