The sides of a fair 5-sided spinner are marked 1, 1, 2, 3 and 4. It is

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The sides of a fair 5-sided spinner are marked 1, 1, 2, 3 and 4. It is spun until the first score of 1 is obtained. Find the probability that it is spun:

a. Exactly twice 

b. At most five times 

c. At least eight times.

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