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What is the eligibility for Railways?

how do i solve para jumbles 

In the explanation of above question it is assumed that there is no overlap between the two chords. However, overlapping chords is also a possibility (as shown in RED lines). If overlapping chords are considered then finding the solution becomes difficult and a different solution can be arrived at. Is there any trick to approaching the problem the way it has been and to eliminate the possibility of overlapping chords?

i never understand pie chart..and unable to solve the questions.. plz give me some tips!

In the solution, why is it assumed that A,C>0 ? We can get B=1 even when both A,C<0. This way the number of total solutions possible is 16. Can someone help me with this?

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value of the expression (x^2 - x + 1)/(x - 1) cannot lie between a) 1,-3 b) -1,-3 c) -4,2 d) -4,-2

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any free video is available or not?