Hello, paulig!

This is long, tedious problem . . .

Your game plan is correct!There are 5 objects that could be "on".

The probabilities for each being "on" is: .

Find the probability that 3 or more of these items are "on".

All five are on: there is one case.

. .

Four are on: there are 5 cases.

. .

Three are on: there are 10 cases.

. .

Then add these 16 decimals.

I'll wait in the car . . .

.