There are 9 students in a class: 7 girls and 2 boys.
If the teacher picks a group of 3 at random, what is the probability that everyone in the group is a girl?

1/3

Step-by-step explanation:

Since there are 7 girls and 2 boys the teacher should do this

1 boy for every 2 girls which there are two 2 so there will be two groups of 1 boys and 2 girls while the last group will all be girls.

Hope this helps. :)

7/9 chance

Step-by-step explanation:

There are 9 students, 7 female and 2 male. 7/9 shows the probability of a female being chosen.

Hope this helps.  :D

My apologies if I contain errors.

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step-by-step explanation:

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(x) - (y) = (1 + 4i)