self Maths Puzzle

find the number of numbers between 300 to 400(one end included),that are not divisible by 2,3,4and 5.

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self Other Question

a school has 378 girl student and 675 boy students.the school is divided into strictly boys or girls sections. all section in the school have the same number of students. then what are the minimum number o0f sections in the school? What is the probability of getting a sum 12 from three throws of a dice?