If you randomly pick a day of the week twice, find the probability of picking (i) the same day twice (ii) adjacent days. [3 MARKS]

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Solution

Sub-parts : 1.5 Marks each

(i) To pick the same day during the second trial as during the first, you have to pick one specific day out of 7 possibilities. Hence, the probability is $\frac{1}{7}$ .
(ii) To pick an adjacent day during the second trial, you have two adjacent days out of 7 possibilities. Hence, the required probability is $\frac{2}{7}$ .

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