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How to prepare DI?

How can I solve  questions of functions nd maxima nd minima faster? 

I am not able to understand probability and permutation , combination

Kya ye mock test Hindi me Ni ho skte ??

What does the mocks cost only cat ones

sir , 

how to solve 9999/999/9

In a hotel 60% had vegetarian lunch and 30% had non vegetarian lunch and 15% had both types of lunch.If 96 people were present how many did not eat either type of lunch????

A cylindrical tank of diameter 35 cm is full of water. If 11 litres of water is drawn off, the water level in the tank will drop by-

how to solve parajumbled sentences

how to prepare for english for coming IB exam