Alternative Fuels To reduce our nation's addiction to oil and to respond to climate change warnings, several alternative fuels and the vehicles that use them are either currently in production or are being considered. Common alternative fuels include pure biodiesel (B100), electricity (e.g., hybrid-electric, or HE), ethanol (e.g., E85, which is a blend of 85% ethanol and 15% gasoline), and hydrogen (H2).
a. How many alternative fuel subsets can be formed?
b. How many subsets contain B100 and E85 together?
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