There are 10 aaa batteries in a box and 3 are defective. two batteries are selected without replacement. what is the probability of selecting a defective battery followed by another defective battery?

The required probability is 1 / 15.

Explanation:

out of 3 defective batteries we can select two  defective batteries in 3 ways  (3C2).  

Total no of possible combination is( 10C2) =  (10 x 9) / 2 = 45.

So required probability is  =  3 / 45 = 1 / 15.  

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.