A teacher was trying to form the groups of students in such a way that every gro

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โœช Choose the correct option.

A teacher was trying to form the groups of students in such a way that every group has equal number of students and that number should be a prime number. She tried for first 5 prime numbers, but on each occasion exactly one student was left behind.

A. 0
B. 2
C. 3
D. 4

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