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Probability of solving of sum correct...

Probability of solving of sum correctly by A ,B and C is `(1)/(2),(1)/(3)` and `(1)/(5)` respectively. The probability that at least one of them solves it correctly is

A

a) 11/15

B

b) 4/15

C

c) 1/20

D

d) 19/20

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