1.

What is the probability of occurring four Wednesdays in 23 consecutive days in a month?

Answer»

23 days = 3 weeks + 2 days Wednesday comes on Tuesday + Wednesday, Wednesday + Thursday when two days are taken. 

Total probabilities (Sunday, Monday), (Monday, Tuesday), (Tuesday, Wednesday), (Wednesday, Thursday), (Thursday, Friday), (Friday, Saturday), (Saturday, Sunday) 

∴ Total probabilities = 7 

∴ Probabilities = 2/7



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