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In a country where people only want boys, every family continues to have children until they have a boy. if they have a girl, they go for another child. if they have a boy, they stop. what is the proportion of boys to girls in the country?
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Kind ofsum of infinite GP
How the ratio comes to be 1:1 by using a/(1-r) ??
Reason: girl boys
sum: N(N+1)/2 N+1
boys:girl 2:N or 1:N-1
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