Question: 5. Twenty identical chips marked as 1, 2, . . . , 20 are put in a container and mixed well. A chip is drawn

5. Twenty identical chips marked as 1, 2, . . . , 20 are put in a container and mixed well. A chip is drawn randomly and the number on the chip is observed. Find the following probabilities that the observed number is

(a) greater than 15,

(b) between 10 and 18 (inclusive),

(c) less than 10.

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