It is 1/6. (It is just the same if the favorable outcome is 1,2,3,4 or 5, provided that it is a fair dice.)
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There is a one out of six chance.
The experimental probability for the die in question is 12/80 = 0.15
The probability of rolling a six is 1 out of 6, or 1/6. Now, perhaps your question is: If I roll a die 180 times, what is the probability of rolling a six at least once. This is the same as rolling a die 180 times and never once rolling a six. The probability is (5/6)180 which is 5.59 x 10-15.
The probability of getting a six on a six sided die and then getting a tails is zero. There is no tails on a die.
The probability is 1. It is a certainty that you will roll a number between and including one and six. The probability of rolling each individual number is 1/6.