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

how to get >90% accuracy in rc and sufficient no of attempts. Most of the times it so happens that i boil down to two choices and mark the wrong one. Pls help.

https://cracku.in/cat/history/1260707.Can you pls explain Q1 in the Test set given in the URL diagrammatically

https://cracku.in/cat/history/1236664. Can you pls explain Q2 in the Test set given in the URL diagrammatically

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

https://cracku.in/cat/history/1269514. Can u Please elaborate on the solution of the 5th Question.

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

A)solving the energy challenge B) requires behavior C) change and new technological D) approaches.E)no error.my answer is b but the correct answre is quoted as E .who is correct?

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