What is the probability of 5 Sunday in the month of December ........

Mathematics (NDA) Probability

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What is the probability of 5 Sunday in the month of December?

1/ 7

2 / 7

3 / 7

None of these

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Explanation:

Number of days in December = 31
$\small \therefore$ Number of complete weeks = 4 (i.e. 7 × 4 = 28 days)
Remaining 3 days can be
(M, T, W), (T, W, Th), (W, Th, F), (Th, F, Sa), (F, Sa, S),(Sa, S, M), (S, M, T)
Out of these 7, 3 are favourable outcomes.
So, probability of having 5 Sunday in the month of december 3/7
.