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Probability of Sneha failing the exam = 1 - (4/9) = (5/9)
Probability of Neha passing the exam = 1 - (5/7) = (2/7)
Probability of both Sneha and Neha passing the exam = (4/9) X (2/7) = (8/63)
Probability that both Sneha and Neha failing the exam = (5/9) X (5/7) = (25/63)
So, required probability = (8/63) + (25/63) = (33/63) = (11/21)
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