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The probability that a student 'A' succeeds in a test is 0.85 and the probability that 'B' succeeds in the same test is 0.75. Then the probability that exactly one of them succeeds in that test is
$$\frac{13}{20}$$
$$\frac{13}{80}$$
$$\frac{13}{40}$$
$$\frac{17}{40}$$
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