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a. 512/7172

b. 818/3132

c. 417/6561

d. 215/5112

a. 0.3828

b. 0.1325

c. 0.3144

d. 0.1553

Ella has these coins.

Jayden has these coins.

Ella takes one of her coins at random and gives it to Jayden.

Jayden adds it to his coins.

Then Jayden takes one of his coins at random and gives it to Ella.

What is the probability that Ella and Jayden now have the same amount of money as each

other?

You must show your working.

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(a) What is the probability that of 10 workers testing positive, 2 are cocaine users, 5 are marijuana users, and 3 are users of other drugs? (USE MATLAB )

(b) What is the probability that of 10 workers testing positive, all are marijuana users? (USE MATLAB)

(c) What is the probability that of 10 workers testing positive, none is a cocaine user?