Find the Next No.

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211




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The centre of the third figure is empty. What digit should fit inside?

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Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
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Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

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