For each of the coins, in order, you have two possible outcomes so that there are 2*2*2*2 = 16 outcomes in all.
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If they are fair coins, it is 1/16.
7/8
The probability of tossing two coins that are different is 1 in 2, or 0.5.The probability of tossing something on the first coin is 1. The probability of not matching that on the second coin is 0.5. Multiply 1 and 0.5 together, and you get 0.5.
Depends on if you are talking about probability. If so then yes. If not then 100 coins is more than 1 coin.