Doubt: data analysis gregmat tickbox 3 q14

[user469]

Why have we not considered the cases for 1/2. it can be 111, 112, … so on. should we not multiply the entire answer with 2^3=8?

[Leaderboard]

We do consider that actually. Yes there are 8 possibilities, but that’s out of 216. \frac{8}{216} = \frac{1}{27}