ii
15
There are seven threes in 21
We only use 10 digits (0 through 9), so I would say, there is one of them.
Not an easy question. Here's a long but logical answer. The chance of not getting a 3 on any throw is 5/6, so the chance of not getting any threes in the first 10 throws is (5/6)^10. Now, having reached that point, the chance of throwing three threes in the last three throws is 1/6 x 1/6 x1/6 or 1/216. So the probability of throwing three threes in any chosen three throws is (5/6)^10 x 1/216. This should seem logical because the probability of throwing three threes in the first three throws followed by ten failures to throw threes, should be the same as just getting threes in the last three throws. The probability is the same for getting threes in only the second, fourth and sixth throw, or any other combination of three throws. Now, there are a set number of combinations of 13 things taken in groups of three. This is given by the formula for C(13,3) = (13x12x11x10x9x8x7x6x5x4)/((10x9x8x7x6x5x4x3x2x1)x(3x2x1)). That cancels down to (13x12x11)/(3x2x1), and equals 286. So, there are this many ways you can pick out three throws which you want to be the threes, and the probability of them actually being threes is the first calculation we did. The answer to the question is 286 x (5/6)^10 x 1/216 which is 0.2138453, about.
About 73.
Not for Threes was created on 1997-10-27.
27 threes are in 81
there are a ton of threes and it's 11 3s
There are four threes in a standard deck of cards.
99 / 3 = 33 threes 100/3 = 33.33 threes which rounded would be equal to 33 threes
Five threes do not equal ten, so you can't use symbols to show that.
i
(3x3) + (3/3) = 10
ii
15
4