JAMB - Biology (2002 - No. 45)
The first four children of a couple were all girls. The probability that the fifth will also be a girl is
1/5
1/4
1/3
1/2
คำอธิบาย
the number of boys or girls the couple has given birth to does not affect their future offspring so it's 1/2 because it is either a boy or a girl