why meritnation is not giving difficult questions.............?

Thanks for letting us know your concern. In future, we will try to add some difficult questions in support of the said topic. Your feedback and suggestions are valuable for us. 

For the time being, you can go through existing study material and if you face any kind of problem then write back to us.

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because you do not answer 

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hey, its my need and that is why i am asking. ok.........

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