Q: We have 3 children, they space all boys, and we currently want an additional child. Need to we provide up ours hope for a girl?

A: also after 3 youngsters of the exact same sex, your opportunities in the following pregnancy having actually the very same one is about even. Having currently 3 guys you may think that a foregone conclusion that the next baby is going to be another boy, however in reality, your opportunities are around equal in between a boy and also a girl. It’s not that inexplicable to have actually 3 kids of the same sex in a row. This actually happens in one out of four couples who have actually 3 children.

You are watching: What is the probability of having 3 children that are all boys?


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Even after 3 children of the very same sex, your possibilities in the next pregnancy having actually the very same one is around even.

How the baby’s gender is determined

Each of the male sperms and each egg carry 23 chromosomes. The sperm and the egg incorporate at fertilization because that a full of 46 chromosomes which come in 23 pairs.The 23rd chromosome is dubbed the “sex-chromosome”. In sperms, that is one of two people an X- or a Y-chromosome, when in the woman’s egg that is always X.If an X-bearing sperm fertilizes the egg, the result 23rd pair is XX, a girl, and also if a Y-bearing sperm fertilizes the egg, the an outcome is XY, a boy.It is therefore the sperm the decides the baby’s gender: X-bearing sperms result in girls, and Y-bearing sperms in boys.In general, X- and also Y-bearing sperms are around equally distributed in the ejaculate, so every time there is around an same 50-50 possibility for every gender.

If you already have a boy, the opportunity that the next baby is likewise a boy is 50 percent

It’s every a matter of mathematics. A pair having 4 youngsters of the same sex in a row happens actually an ext often 보다 you could think. In fact, one in eight couples (12.5%) v 4 kids have 4 that the exact same sex.

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Here"s just how it goes:

Couples v 2 children: 50% of couples have actually 2 girls or 2 boys, and also 50% the couples have actually 1 girl/1 boyCouples v 3 children: 25% of couples have actually 3 girl or 3 boys, and also 75% have 1 boy/2 girl or 1 girl/2 boysCouples v 4 children: 12.5% of couples have actually 4 girls or 4 boys, 37.5% will have 1/3 and also 50% will have 2/2.Couples with 5 children: 6.25% have actually 5 the very same sex and in couples through 6 children, 3.125% will have the exact same sex.

 

All exact same sex

Different sexes

 

2 children

50% G/B

50% B/G 

 

3 children

25% every girl or every boys

75% BB/G or GG/B

 

4 children

12.5% all girls or all boys

37.5% 1B/3G or 1G/3B

50% BB/GG

5 children

6.25% all guys or all girls

25% BBBB/G or GGGG/B

68.75% GGG/BB or BBB/GG

6 children

3.125% all guys or every girls

12.5% BBBBB/G or GGGGG/B

46.875%: GGGG/BB or BBBB/GG

 

 

 

 

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