1.

A contest consists of predicting the results win, draw or defeat of 7 football matches. A sent his entry by predicting at random. The probability that his entry will contain exactly 4 correct predictions is

A.        \[\frac{8}{{{3}^{7}}}\]    
B.        \[\frac{16}{{{3}^{7}}}\]
C.        \[\frac{280}{{{3}^{7}}}\]
D.        \[\frac{560}{{{3}^{7}}}\]
Answer» D.        \[\frac{560}{{{3}^{7}}}\]


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