SOLUTION: ​Pamela's computer printer allows for optional settings with a panel of four ​on-off switches in a row. How many different settings can she select if at least one switc

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Question 1107368: ​Pamela's computer printer allows for optional settings with a panel of four ​on-off switches in a row. How many different settings can she select if at least one switch must be on?
Found 2 solutions by addingup, Alan3354:
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
She can choose switch 1, or switch 2, or switch 3, or switch 4 = 4 possible selections

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Pamela's computer printer allows for optional settings with a panel of four on-off switches in a row. How many different settings can she select if at least one switch must be on?
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1 = On
0 = Off
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2^4 = 16 combinations.
Only 0000 is not allowed.
--> 15 different settings