self Maths Puzzle

(2467)153*(341)72

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self Other Question

can we have 4 points is space that are all equidistant from one another? if yes how will you place them? In a class of 30 students, 12, 16, 15, 22 and 18 students have passed in Phy, Chem, Biology, Maths and English respectively. What is the maximum possible number of students who passed in at most two
subjects?