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JEE MATHEMATICS MCQ: PERMUTATIONS

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A class has 21 students. The class teacher has been asked to make nn groups of rr students each and go to zoo taking one group at a time. The size of group zoo i.e. the value of rr) for which the teacher goes to the maximum number of times is (no group can go to the zoo twice)
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Correct option: B
10 or 11
Option A (0,π4)∪(3π4,π)\left(0, \frac{\pi}{4}\right) \cup\left(\frac{3 \pi}{4}, \pi\right) is correct because it is the interval where β−α\beta - \alpha lies, derived from the given trigonometric conditions.

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