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What is the square root of negative zero? Why carbon from a variety of organci compounds in variety of shapes? The mass of a 45.750 g piece of copper? How many grams of mercury are present in a barometer that holds 7.0 mL of mercury? Please help in detail!? An unbiased coin is tossed 'n' times Let the random variable X denote the number of times the head occurs if P(X=1) ,P(X=2) and P(X=3) are?