Solve A= a+b/2 for b
1 answer:
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Answer:
The probability that Andrew will be among the 4 volunteers selected and Karen will not is 2/7.
Step-by-step explanation:
From the given information it is clear that
The total number of volunteers, including Andrew and Karen = 8
The total number of volunteers, excluding Andrew and Karen = 8-2 = 6
We need to find the probability that Andrew will be among the 4 volunteers selected and Karen will not.
Total number of ways of selecting r volunteers from n volunteers is
Total number of ways of selecting 4 volunteers from 8 volunteers is
Total number of ways of selecting 4 volunteers from 8 volunteers, so that Andrew will be among the 4 volunteers selected and Karen will not is
The probability that Andrew will be among the 4 volunteers selected and Karen will not is
Therefore the probability that Andrew will be among the 4 volunteers selected and Karen will not is 2/7.