1 .	There are three events $E_1$,$E_2$,and $E_3$ One of which must, and only one can happen. The odds are 7 to 4 against $E_1$,5 to 3 against $E_2$ The odds against ,and $E_3$ is
[ A ]    4 : 11 [ B ]    3 : 8 [ C ]    23 : 88 [ D ]    65 : 23
Answer : Option D Explanation :
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