Hey everyone,

Here's the question:

a)Two dice are thrown n times in succession. Compute the probability that a double six appears at least once. How large does n have to be for this probabablity to be at least 1/2?

b)Two dice are thrown n times in succession. Compute the probability that some double(be it 6's or 5's...) appears at least once. How large does n have to be for this probability to be at least 1/2?

ok, so I know that the probability for double sixes would be 1/6 * 1/6 = 1/36. I definitly don't know how to figure out how many throws you would need for the probability to be 1/2.

Thanks!