Say Cheeze
Probability
Level
pending
A team of 3 boys and 2 girls all line up for a group selfie photo. How many ways are there for at least 2 boys to stand next to each other?
The answer is 108.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
Answer
= n(all possible lineups) – n(alternating lineups, BGBGB)
= 5! – 1 × 3!2!
= 120 – 1 × 6 × 2
= 108