The cubic f(x) = x3 - 7x - 6 has three distinct roots, a, b, and c. Compute 1/a + 1/b + 1/c .  Choose the correct choice from the following choices:
A) -5/6
B) -6/6
C) -7/6
D) -8/6
E) -9/6
1/a+1/b+1/c=ab+bc+ca/abc   =-7/-6   =-7/6   correct answer -7/6
<result>C</result>
The cubic f(x) = x3 - 7x - 6 has three distinct roots, a, b, and c. Compute 1/a + 1/b + 1/c .