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A DRAWER HOLDS 4 RED HATS and 4 blue hats .What is the probability of geeting exactly 3 red hats or exactly 3 blue hats randumly out of the drawer and immediately every hat to the drawer before taking out the next?

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If a 2 inch silver crystal(2*2*2) of 1.5kg ,is of 10000rs..Then what is the cost of same 3 inch silver crystal?? The maximum possible value of (8x - 64x) over all real values of x is