Afish tank contains 18 goldfish and 22 guppies. if you randomly select 2 fish, what is the probability that they are both goldfish?
a.1/36
b.1/22
c.51/260
d.1/20

This depends on if you take the first fish out.

If so, find the odds of picking a goldfish the first time:

Next, find the odds of picking one again without replacing it:

To find the odds of both, multiply the two together:

isn't an answer, so refer to the next part.

For this question you still do the same as above, but without reducing the totals.
Find the odds of picking a goldfish the first time:

Next, find the odds of picking one again without removing it:



Since also isn't an answer, I'm assuming that there was a mistype for answer C, .