In a refrigerator/freezer combo, the probability that both the refrigerator and freezer will fail is 1%. The probability that just the refrigerator part will fail is 5%. Given that the refrigerator part
has already failed, what is the probability the freezer part will also fail?

the answer is 8/21

hope this

i can answer this if i have the answer choices

the diagram shows you   triangle def with de=4, df=9 and de≠df≠ef.

the sum of the lengths of two triangles' sides are always greater than the length of the third side:

substitute sides lengths:

then 5< ef< 13 (option 3 is true).

def is a scalene triangle with all sides of different lengths (option 5 is true, option 2 is false).

answer: correct choices are 1, 3 and 5