You have 10 plums total so 7/10 is the probability that the first plum is yellow.
Once you have picked one yellow plum, there are only 6 yellow plums left and 9 plums total so the new probability is 6/9.
There are 3 red and 7 yellow plums. I take 2 plums continuously. How much is the probability that both are yellow plums.
I found the solution 7/10*6/9=7/15.
7/10 is the first probability of a yellow plum but what is 6/9 ? How to get this 6/9 ?