Question
For a drama, 3 students need to be selected out of 6 students A,B,C,D,E and F. If A is already selected, what is the probability of selecting C also?
Answer: Option D
:
D
If A is selected, then two more students need to be selected. This can be done in 5C2ways= 10
If C is also selected, only one more out of the remaining 4 needs to be selected.
That can be done in 4 ways.
Thus, Probability =410= 0.4
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:
D
If A is selected, then two more students need to be selected. This can be done in 5C2ways= 10
If C is also selected, only one more out of the remaining 4 needs to be selected.
That can be done in 4 ways.
Thus, Probability =410= 0.4
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