The chance that any given bulb is on is equal to 1/2. The chance that all twenty bulbs are on at the same time is 
You and your friends are planning to join a cycling tour of Europe. You want to know how much it will cost you and your friends
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We can seperate (3b³) into two different parts, the constant and the variable.
The constant (3) and the variable (b) can both be squared and multiplied to get the correct answer, so:
3² = 9
(b³)² =
So,