add the previous two numbers: 8 Two trains, Train A and Train B, simultaneously depart Station A and Station B. Station A and Station B are 252.5 miles apart from each other. Train A is moving at 124.7mph towards Station B, and Train B is moving at 253.5mph towards Station A. If both trains departed at 10:00AM and it is now 10:08, how much longer until both trains pass each other?
x in the previous question is -11, not -9. and the x in your pattern is 8 because (3+5) try mine then 7, 7, 7, 21, 35, 63, 119, 217, X, 735, 1351, 2485 ... solve for X EDIT: about 32 minutes, I think also check your preceding answer ('tis 8, not 7)
Simple One: 2n-1=0/2n+7 Solve for n More Complex: Input: Output: 1 22 153 1384 13675 142366 1577677 X Derive an equation (function) for this pattern and also solve for X (the 7th term in this function) The answer to yours is x = 399 First, divide the entire set of numbers by 7: 1, 1, 1, 3, 5, 9, 17, 31, x/7, 105, 193, 355.... This step is really just for simplification, you don't HAVE to divide by 7, this is just how I broke it down Now you can begin to see, you can find the nth term by adding (n-1)th term, (n-2)th term, and the (n-3)th term 9 + 17 + 31 = 57 x/7 = 57 x = 399
63 What's your definition of simple? Are you talking about 8 * 4, as in the previous example, finding the sine of the 60 degree angle, employing an alternating test to determine if the series, ((-1)^(n+1))/n from 1 to infinity is convergent or divergent? Could get really crazy and ask everyone to use the moment generating function to prove the standard distribution formula (doubt even lucky is that good with math). How crazy do you want it to get? EDIT: Ninjaed by the doc. Geez you're evil - quadratic formula now O.O
Hit something weird with edit on the last post and couldn't edit the solution in, so putting it here. x = -2 +/ Square root of 20 all divided by 2. Question: You have a basket of 12 balls: 4 blue, 4 black, 4 white. You have to pick three balls without replacement. What is the probability of getting exactly 1 blue, 1 black and 1 white ball?
A stream of problems resembling one of those "fast math minute" worksheets from grade-school could be borderline spam IMO. The last few posts have been basic algebra, which, for the most part, is simple indeed. It's only natural we find a threshold between "simple" and having to think at least a little bit. If someone wants to mix in the purest basics, they can. This should not prohibit other basic skills from being put to use.
Would be right if you're replacing, but you're not. So each time you pull the ball out, you're down a ball for the next selection. Feel free to try again.
