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If the gas in a cylinder is used up, does it mean that there is now vacuum inside or air inside the cylinder?

Asked by Rohit 24/05/2015 Last Modified 24/05/2015

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In case of two 2-digited numbers whose digits in 10's place are same and sum of the digits in unit places is 10 For example:- 38 and 32 (10's place digits are equal and 8+2=10) 38×32 can be found...

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