Hello!
A box contains 5 green pencils and 7 yellow pencils. Two pencils are chosen at random from the box without replacement. What is the probability they are both yellow?
Data:
total pencils: 12
green pencils: 5
yellow pencils: 7
We can choose two pieces between the twelve, therefore, we have a simple combination:

Now, we choose two among the seven yellow:

Therefore, the probability of both being yellow:

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I Hope this helps, greetings ... Dexteright02! =)