There are 26 = 64 possible outcomes.
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There is 2 outcomes for flipping the coin, and 6 outcomes for rolling the cube. The total outcomes for both are 2*6 = 12.
If a coin is tossed 15 times there are 215 or 32768 possible outcomes.
There are 26 = 64 possible outcomes.
There are 2^5 (2*2*2*2*2), or 32, possible outcomes of tossing a coin 5 times. Only one of those outcomes does not contain any tails. This leaves us with 31/32, or 97% chance of at least one toss coming up tails.