Janie flips a coin 70 times and records if it comes up heads. if getting heads is a success, what is the probability of a failure?

The probability of afailure each time that the coin is flipped is 1/2 = 0.5.

If that is the question, the solution was pretty simple and the answer is 0.5.

But, it seems that they could be asking for the probability of not getting a head in 70 flips.

If this is the case, then the probability of failure is (1/2)^70 =  8.47*10^-22.

Then it is necessary to have the full context, but what I have explained should give the answer. Let me know, please.

With a continuous thought process.