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Question: In one country they prefer only boys to have. If it is a girl in the
first birth then there must be the other child to have,
if it is also a girl then they will go for the next birth and stops when
they got the boy. Then what is the proportion of
girl to boys in that country?
Answer: (n+1)/2:1 |
| September 09, 2007 10:07:50 |
#1 |
| man12 |
Member Since: July 2007 Total Comments: 1 |
RE: In one country they prefer only boys to have. If i...
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First birth is Girl, Second is Boy 1:1
First, Second is Girl, Third is Boy 2:1 (1+1):1
First, Second, .......nth is Girl (1+2+...n):1
Ratio of Girls : Boys is (1+2+3+......+n):1
= n(n+1)/2:n |
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