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A number of students after standing in a circle and are evenly spaced. They are numbered 1,2,3,.... In a clockwise manner. If the fifth student is standing

directly diametrically opposite to the twenty-fifth student, how many students are standing in the complete circle.?



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See diagram to understand easily.

5 and 25 are standing on the diameter.  So students with numbers 6 to 24 are on one side of the diameter.   So they are 19. So on the other side of diameter also there are 19 students.  

Hence in total there are  19 + 2 + 19 = 40 students.

0 0 0
6-24 members are on one side of the circle
so this side there are 19 students
the other side also there should be 19 students and two at the ends of diameter.
so the total no. of students
there were total 40 students

1 5 1
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