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Aside from the 3 extra 2-cent envelopes, there are (x-2)/2 2-cent envelopes, and the same number of 5-cent envelopes. Adding those together, plus the 6 cents for the 3 extra 2-cent envelopes, the total cost is:
[(x-2)/2][5+2] + 6
=[(x-2)/2]*7 + 6
=(7x - 14 + 12)/2
=(7x - 2)/2
(1) If line m doesn't pass through (2,0), you it COULD pass through the origin, but it also could not. Insufficient (2) If line m passes through point (1,0), it could pass through the origin if it's a horizontal line, but if it's not it won't. Insufficient If line m passes through both of those poin...
The possibilities are:
5 5 _
5 _ 5
_ 5 5
There are 9 possible values for each of the first two (all digits except 5), and 8 possible values for the last one (all digits except 5 and 0). So there are 26 3-digit numbers with exactly two 5s.
5^13 â€“ 3(5^13 â€“ 5^12) 5^13 â€“ 3[5^12(5 â€“ 1)] 5^13 â€“ 3(5^12)(4) 5(5^12)â€“ 12(5^12) (-7)5^12 The correct answer is D. Can someone explain what operations are taking place in the first 2 lines? Thanks in advance. In the second line, you factor out 5^12 from (5^13 - 5^12), which gives you 5^1...
(1) The prime factorization of 72 is (2^3)(3^3), which looks just like the equation given, so x=3, y=2, and x+y=5.
(2) Can be re-written as 2^(x+y)=32, so x+y=5.
Answer is D.
Let me explain: Any number can be written as product of primes. Example: N = P1^k1 * P2^k2 * P3^k3 *.... Where P1,P2,P3... Are all primes and K1,K2,K3 are their powers. Then the number of factors of N is given by the formula (k1+1)(k2+1)(k3+1).... In this example: 450 = 2*5^2 * 3^2 Hence number of ...
Ah yes of course! I'm still not sure I understand your reasoning above, even though you did end up with the right answer.kvcpk wrote: nicolez.. You missed 225. Total turns out to be 9.
prime factorization: 450 = 2 x 3 x 3 x 5 x 5
The odd factors (besides 1) are the odd prime factors and the odd prime factors multiplied by each other (3x3, 5x5, 3x5, 3x3x5, 3x5x5).
positive odd factors of 450: 1, 3, 5, 9, 15, 25, 45, 75
So there are 8 positive odd factors of 450. Is that right?
Hi Jayanth, Sounds like you have a pretty good plan. I recently started studying and I plan on using Kaplan 2011 (which I'm on now), all the VeritasPrep books, and OG 12 before taking the GMAT hopefully at the end of this year. 8 months seems like a long time to stretch out your studying, but I don'...
I have the same problem! I also just took my first practice GMAT and had 20 minutes left on each section. I kept rushing through (especially on quant) because I was afraid of spending too much time on any one question. If anyone has any advice on this, I would greatly appreciate it.
Update: I just took my first practice CAT test! It was a Kaplan test, and I got a 720 (Q46, V43) - 3 questions wrong in quant, 5 wrong in verbal. How accurate do you think my score is? I also finished each section about 20 minutes early, so I really need to work on slowing down.
I have a circle with center O and angle POQ=90 degrees (with P and Q being on the circle). If we have O=90 degrees, and length of PQ is 4 pie, how can we find the radius? Hold on, are you sure PQ is refering to the arc? From the wording of the question it sounds like PQ is (or could be) the chord P...
Here's my untested, unproven, I-just-made-this-up-but-it-sounds-pretty-legit guide to mastering SC. Procede at your own risk. :) (SC is my best area so I'm not actually studying like this.) 1) Before jumping into all those practice questions, do a thorough review of everything the GMAT tests on SC. ...
- by nicolezl
Fri Aug 06, 2010 5:11 am
- Forum: GMAT Strategy
- Topic: 1000 SC questions.. should DO or should NOT DO ???
- Replies: 1
- Views: 677
Hmm...well the original advice was more for quant I think. For SC you basically know the grammar rules or you don't. So if you're looking back on an SC question you got wrong, you should just make sure you understand the rules that apply to it. Also make sure you know why the wrong answers are wrong.
Hey, Here's the advice I got from Brian (Brian@VeritasPrep) when I started studying a few weeks ago: "My biggest piece of advice for getting started - be prepared to ask the question "why" a lot, and you'll find it to be incredibly helpful: -Why does this formula or number property hold true? (Under...