The probabilities that a student will receive an A, B, C or D grade are 0.4, 0.3 , 0.2 and 0.1 respectively. Find the probability that a student will receive Atleast B grade.
A) 0.21 B) 0.3 C) 0.7 D) None of these
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Option A is the correct answer........
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option 1
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