A group of 100 teenagers were asked which social media apps they use from Instagram (III), TikTok (TTT), and Snapchat (SSS).
All 100 teenagers use at least one of the apps.
25 use all three apps.
20 use Instagram and TikTok but do not use Snapchat.
40 use TikTok and Snapchat.
32 use Instagram and Snapchat.
70 use TikTok.
4 use only Snapchat.
One of the teenagers is picked at random.
Work out the probability that this teenager uses Instagram.
