Answer:
1/2
Step-by-step explanation:
we know that 1/4 of them failed, meaning that 3/4 of them passed.
1/3 of 3/4 is 1/4, meaning that 1/4 of the class got an A.
If 1/4 failed, and 1/4 passed with an A, that leaves 2/4 of the class that passed but didnt get an A, which simplifies to 1/2.
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