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re: Cashier at store told me one guy has spent $4000 on Powerball
Posted on 1/12/16 at 10:56 pm to buckeye_vol
Posted on 1/12/16 at 10:56 pm to buckeye_vol
quote:
Recently my sister-in-law found out she was having twins, and her husband, an engineer, said, "there is a 2/3 chance of having a boy because there are three scenarios." I tried to explain that it's actually 3/4 (assuming 50/50 for each child), and he still looked unconvinced.
Identical boys
Identical girls
Fraternal Boys
Fraternal Girls
Fraternal girl/boy
Identical boy/girl
4/6 = 2/3
3
Posted on 1/13/16 at 12:37 am to tiggerthetooth
Whether they are identical has no bearing on gender...
Posted on 1/13/16 at 7:58 am to tiggerthetooth
Identical boy/girl doesn't exist. If there are twins that are boy/girl, they are fraternal.
Posted on 1/13/16 at 8:03 am to tiggerthetooth
quote:No. Boy/Girl must be includes with Girl/Boy. In other words, there are two possiblities of having a boy (twin 1 or twin 2); it's like flipping a coin. HERE Is a good explanation.
Identical boys Identical girls Fraternal Boys Fraternal Girls Fraternal girl/boy Identical boy/girl 4/6 = 2/3
The four outcomes are as follows:
BB
GG
BG
GB
So it's 3/4.
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