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21. A day of the week is to be chosen at random from the 7 day week. Let event A be that a day

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21. A day of the week is to be chosen at random from the 7 day week. Let event A be that a day from the 5 day work week was chosen. Let event B be that the day of the week chosen starts with the letters S or T. Find P(A) and P(B). Are events A and B mutually exclusive? Why?

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