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Each time they have a child, there is a 50% chance it will be female.Therefore the chance of getting three daughters in a row is 12.5% (0.5 X 0.5 X 0.5 = 0.125).
you have a 75% chance
Each chance of a having a girl is 50% or 1/2. Three different children are separate events and so multiplying the chance all three together gives 1/2 x 1/2 x 1/2= 1/8. 1 in 8 chances will someone have three girls in a row.
There is no simple answer to the question because the children's genders are not independent events. They depend on the parents' ages and their genes. Also, the answer will depend on how many children there are in total.
The chance of any 1 number appearing in a die roll 3 times in a row is: 1/6 * 1/6 * 1/6 which is 1/216 = .00463