exam Maths Puzzle Numerical Ability

The importance of geometry’s role in the math curriculum is debated in many high schools and colleges. Some schools offer the course while others have done away with it. Based on w

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I need your help solving this equation w/4-21=-3 Suppose you have a bag that contains 4 black, 3 green, 1 red, and 2 orange marbles. Find each probability.

P(red, then orange when red is not replaced)

Thanks this question is hard, by the way P means probability.