How many times would you need to flip a coin on heads in a row to get the odds 1:10,000,000,000?

Question

How many times would you need to flip a coin on heads in a row to get the odds 1:10,000,000,000?

Answer 1

The general formula is that the odds of getting all heads in 'n' flips is 2^n. (2 times itself n times). If you flip twice, the probability of both heads is 1 in four.

If you flip 33 times, the probability is 1:8,589,934,592.

If you flip 34 times, the probability is 1:17,179,869,184.

Answer 2

About 33.

Answer 3

33

Answer 4

It doesn't matter how many times you flip it. The odds are never going to change. The correct answer is 1 in 2.