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If 2 cards from a standard deck are selected randomly, what is the probability that either 2 kings or at least 1 ace occurs? 1+ (5/3) + (12/9) + (22/27) + (35/81) + .. how to find the sum of n terms? (Sn)? How do you balance Ag HNO3 yields NO AgNO3 H2O? i cant seem to get it? Determine the mass of potassium in 35.5 g of KBr? 1. By using the scalar product of two vectors, show that the points A (1,-2) B (3,0) and C (5,2) are collinear?