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A purse contains 4 copper coins and ...

A purse contains 4 copper coins and 3 silver coins the second purse contains 6 copper coins and 2 silver conis. A coin is taken out form any purse the probability that it is a copper coins is

A

a) 4/7

B

b) 37/56

C

c) 3/7

D

d) 3/4

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