In a certain test there are questions. In this test
students gave wrong answers to at least
questions, where
. If the total number of wrong answers is 4095, then value of
is
11
12
13
15
The number of students answering at least r questions incorrectly is .
The number of students answering exactly
questions incorrectly is
.
Also, the number of students answering all questions wrongly is .
Thus, the total number of wrong anser is
.
Now, .
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