Tribute to a very special woman...

The following was written by one of my daughters. It expresses what each of
us feels every day after six years...
A little boy walks by alone on the sidewa...
1 month ago
The answer is 150.
ReplyDeleteIf three dice are thrown, the probability of NOT getting triple sixes is 1(1/6)^3 = 215/216. So the probability of not getting triple sixes in n throws is (215/216)^n
Now we solve an inequality.
(215/216)^n < 0.5
log[(215/216)^n] < log(0.5)
n * log(215/216) < log(0.5)
n > log(0.5)/log(215/216) = 149.37...
n >= 150