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There are 13 girls and 7 boys in Ms. Sally's 3rd grade class waiting to have...

There are 13 girls and 7 boys in Ms. Sally's 3rd grade class waiting to have their individual photos taken for the current school year. If two students are being randomly selected without replacement, find the probability the second child chosen is a girl.

Give your answer as a decimal rounded to 4 decimal places.

(Hint: In this problem you may need to consider two cases. In the first case, the first child chosen is a boy and then the second child chosen is a girl. In the second case, the first child chosen is a girl and so is the second child.) I come up with the wrong answer after setting up as told, can you show me step by step so I can see what I am doing wrong please

math   Statistics-And-Probability   
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