Scientific Maths

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?




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What always comes into a house through the keyhole?

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This was asked in an interview with Coa-Cola.

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He then told me that he will leave the room and i need to place all the marbles in two boxes.

And When he come back, he will draw a marble from any of the two box and if the marble is white I will be hired.

Also
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Can you calculate the total amount he had initially?

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I never was there, I am always to be.
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Suppose you are a girl candidate and sitting in an interview. Suddenly the interviewer asks you, 'What if one morning you wake up and find out that you are pregnant?

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Can you think of any three-dimensional shape that comprises of exactly two surfaces?

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