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Question 1
A box contains 3 coins, one coin is fair, one coin is two headed and one coin is weighted, so that the probability of heads appearing is $\frac{1}{3}$ . A coin is selected at random and tossed, then the probability that head appears is
A.
$\frac{11}{18}$
B.
$\frac{7}{18}$
C.
$\frac{1}{8}$
D.
$\frac{1}{4}$
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