If the students of a class can be grouped exactly into 6 or 8 or 10, then the minimum number of students in the class must be :

If the students of a class can be grouped exactly into 6 or 8 or 10, then the minimum number of students in the class must be :
[A]60
[B]120
[C]180
[D]240

120
Because the required number of students = LCM of 6, 8, 10 = 120.
Hence option [B] is correct answer.

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