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Problem of the day !


 We have started one more interesting feature of the blog 
I will be posting problem of the day , and the best answer will be highly appreciated 

If you win problem of the day for more than 4 times in a  week then I will send you a mathematics very interesting E-Book 

So here is Question 1 )

QUESTION 1 )

How many digits does the number 21000 contain?

NOTE : 

You have to give solution of your answer too 

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