Question 1142965
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0 girls: BBBB  1 way<br>
1 girl: GBBB, BGBB, BBGB, BBBG  4 ways
2 girls: GGBB, GBGB, GBBG, BGGB, BGBG, BBGG  6 ways
3 girls: GGGB, GGBG, GBGG, BGGG  4 ways
4 girls: GGGG  1 way<br>
A total of 2^4 = 16 different possible orders....<br>
You can calculate the probabilities.