mhazelm wrote:I didn't study for it at all and figure my score is down because I missed the second question which needed a trick I can't remember ("what is the lowest value of k such that 22! is a factor of 9^k?" - I can't remember stupid trick for this!)
cato88 wrote:mhazelm wrote:I didn't study for it at all and figure my score is down because I missed the second question which needed a trick I can't remember ("what is the lowest value of k such that 22! is a factor of 9^k?" - I can't remember stupid trick for this!)
Did you really get that as a second that question sounds more like a math subject gre question
mhazelm wrote:
"what is the lowest value of k such that 22! is a factor of 9^k?" - I can't remember stupid trick for this!
swepi wrote:Is the question supposed to be, what is the smallest value of k such that 9^k is a factor of (22!)
abeboparebop wrote:swepi wrote:Is the question supposed to be, what is the smallest value of k such that 9^k is a factor of (22!)
Yeah, that was the question.
grae313 wrote:abeboparebop wrote:swepi wrote:Is the question supposed to be, what is the smallest value of k such that 9^k is a factor of (22!)
Yeah, that was the question.
Then the answer is 0. 1 is a factor of every number.
robertson wrote:Two options:
1) ETS made a mistake with the choices (rather possible)
2) You read smallest when the question was:
what is the biggest value of k such that 9^k is a factor of (22!)
Then the answer is 4, which agrees with the options.
Numbers that add a 3 factor: 3, 6, 12, 15, 21
Numbers that add two 3 factors: 9, 18
Exponent of three in 22!: 9
biggest value of k: 9/2 = 4
I know you already solved it, but it might be helpful if someone reads this topic and doesnt want to think.
twistor wrote:Honestly, I would've gotten that question wrong, too. Not because I don't understand math or prime factorizations, but because I see problems like that and know immediately there is some trick the test writers have in mind.
robertson wrote:I am not totally convinced that Gre is all about learning how to do the Gre. In a perfect world no one would try to prepare it and then the exam would test exactly your skills in this kind of fast math problems. However, the test is really repetitive and this allows people to prepare and score high, something that otherwise would not happen.
It is just an opinion, but you take a look at this question and it is not a trivial one, but probably everyone will be able to solve it in 15 min, that is why they give you 1 min. But then what you've said can also happen, someone may know the trick and solve it in 5 sec. Conclusion: high score means you're smart or you're a hard worker. What does a low score mean? Nothing good, but not necesarily bad.
I have always had this discussion with many people in maths competitions. If you win, are you smarter? Is it fair to win because you have prepared it ten times more than a guy that is three times more inteligent than you? I always ended up saying the same, the truth is that if you aren't one of the winners you are not demonstrating anything. Like in the Gre.
deconvoluted wrote:When confronted with this problem, unless you see a trick IMMEDIATELY, the way to go is to be Joe Bloggs. Dumbly list out every single number in 22! and pull out 3-factors. It's inelegant. It's slow. But it will probably take 1 minute of relatively fast writing. That leaves you 10 seconds or so to check your answer, which is enough.
mhazelm wrote:does anyone know how the SAT compares to the ACT? I live in the West and we only use the ACT out here, so I never took the SAT.
cato88 wrote:In the end I dont think anyone takes the exams that seriously but people try to put weight on them because it makes the hard choice of deciding grad school admissions easier. We could also throw quarters at a wall and whoever gets closest gets into the grad school of their choice I guess.
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