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Use the following experiment to answer items 21 to 22.
Experiment: Getting a repeated digit from a basket of BINGO balls.
21. What is the event?
a. Getting a BINGO ball with a repeated digit
b. Getting all BINGO balls with a repeated digit
c. Getting a BINGO ball with two digits.
d. all of the above
22. What is the total of possible outcomes?
a. 75
b.15
c.6
d.0​