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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 

I recently buy a mock but it,s not active

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

sir I want to buy sbi po pre test series bt I m unable to take because it wants coupon code I dnt hv any code plz help me

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?