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anyone purchased the complete cracku course?? is it worth purchasing ?

what is formula for (a-b)^2..
it's answer is a^2+b^2-2ab...
then how can it be a^2+b^2-4ab. . !!
can u plz explain

A pipe can fill a tank in 6 hours,but due to a leakage it took 8 hours to fill the tank .if the tank is full, in what time will the tank become empty due to the leakage?

https://cracku.in/banking/history/1378642?src=test solution having mistake.correct it

https://cracku.in/banking/history/1374854?src=test...please check answer of Q5. its 3 or more than 3????

How to solve a circular arrangement questions

can help me reasoning

SEATING ARRANGEMENT

if the ratio of boys and girls is 4:5,if 200 girls is taken out ratio becomes 6:7,find the no of girls??????

how do i solve para jumbles