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can anyone explain the solution to the above question?

9 dots placed in a plane , ho many right angle triangle can be formed? @MarutiKonduri  Please help with approach, I am unable to form any squares or rectangle !!!!! @pvaaditya 

How can I prepare for cat more effectively with basic knowledge of high school?

DEAR is coded from (7) (21) (21) (7)

NOSE is coded from

tricks to solve quadratic equation

how many mock tests are given to us when we perchase at the begining..around 300..can u explain where they are???

What is the simplest way to find r in the following equation:

10r^+5r+1=1.75

inequalities tricks

please explain?

can someone help me with the solution

Could you please tell me shortcuts for solving man-work problems like-2 men and 5 women can complete a piece of work in 8 days and 4 men and 3 women can complete the same work in 5 days.How log will 3 men and 4 women take to do the same job?