• Choice F
    C=1({1}{4}+{1}{3})={5}{12}C=1-(\frac\{1\}\{4\}+\frac\{1\}\{3\})=\frac\{5\}\{12\}
    x=180×{5}{12}=75\therefore x=180\times\frac\{5\}\{12\}=75

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