only 1/3 of a class studied for a test. those who did study were certain to pass but those who didn't study had only a 1/4 chance of passing the test. find the probability thata student did not study for thr test if she passed it

1 answer

1/3, (4/12), studied and passed

2/3 did not study ... 1/4 of them (2/12) passed

so 1/3, [(2/12) / (6/12)], who passed the test didn't study
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