Question 1079883
Look at the possible outcomes.
There are {{{2^4}}} or {{{16}}} of them.
Also list the number of girls for each outcome.
GGGG-4
GGGB-3
GGBG-3
GGBB-2
GBGG-3
GBGB-2
GBBG-2
GBBB-1
BGGG-3
BGGB-2
BGBG-2
BGBB-1
BBGG-2
BBGB-1
BBBG-1
BBBB-0
So then sum up each occurrence for the number of girls,
4G:1
3G:4
2G:6
1G:4
0G:1
So then the probability would be the number of outcomes divided by the total number of outcomes,
4G:{{{P(4G)=1/16}}}
3G:{{{P(3G)=4/16=1/4}}}
2G:{{{P(2G)=6/16=3/8}}}
1G:{{{P(1G)=4/16=1/4}}}
0G:{{{P(0G)=1/16}}}