Question: Bill and Mark take turns picking a ball at random from a bag containing four red balls and seven white balls. (I need detailed steps

Bill and Mark take turns picking a ball at random from a bag containing four red balls and seven white balls. (I need detailed steps with explanations, thank you.)

(a) The balls are drawn out of the bag without replacement and Mark is the first person to start. What is the probability that Bill is the first person to pick a red ball?

(b) The balls are drawn out of the bag with replacement and Mark is the first person to start. What is the probability that Bill is the first person to pick a red ball?

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