Number Trivia

Can you find out which number multiplied by itself will give the output as 12345678987654321?




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Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
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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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An express train takes 3 seconds to enter the tunnel which is 1 km long.
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Amazing Facts

Out of the Box

The phrase “thinking outside the box” was popularised from the solution to a topographical puzzle involving 9 dots in a box shape.