Question

N a class of 120 students numbered 1 to 120, all even numbered students opt for physics, those whose numbers are divisible by 5 opt for chemistry and those whose numbers are divisible by 7 opt for math. How many opt for none of the three subjects

Answer 1

students obtained for physics, chemistry and maths: 81

therefore, students obtained for none of the three subjects: 120 - 81 = 39

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