Search found 10 matches
The code could be either 4 lettered or 5 lettered. First take 4 letter codes _ _ _ _. Each letter (blank) can be filled in 26 ways since there are 26 alphabets. So total no.of combinations is 26*26*26*26 = 26^4. Similarly total no.of combinations for 5 digit codes is 26*26*26*26*26 = 26^5. Total no....
- by manred
Tue Jul 24, 2007 8:47 pm- Forum: Problem Solving
- Topic: Problem Solvin question
- Replies: 4
- Views: 1589
4^17 - 2^28
= 2^34 - 2^28
= 2^28 (2^6 - 1)
=2^28 (64 - 1)
=2^28 * (63)
=2^28 * (9 * 7)
=2^28 * 3^2 * 7
So the prime factors of (4^17 - 2^28 ) are 2, 3, 7
Hence the greatest prime factor is 7.
- by manred
Tue Jul 24, 2007 8:29 pm- Forum: Problem Solving
- Topic: Prime Factor Question (GMAT Prep Exam)
- Replies: 2
- Views: 1884
The answer is A.
Fn(9) = 3*9 = 27, since 9 is odd
Fn(6) = (1/2)*6 = 3, since 6 is even
Fn(9)*Fn(6) = 27*3 = 81
- by manred
Tue Jul 24, 2007 8:22 pm- Forum: Problem Solving
- Topic: GMAT Prep: Functions
- Replies: 6
- Views: 2372
Phantom, I agree that 125 has roots 5, -5 and -5, but for other value of n (other than 3) is (n+2)^n = 125? I think the only possible value of n satisfying that equation is 3. hence I believe the answer to be B. Can you provide an eloborate explantion?
- by manred
Tue Jul 10, 2007 7:10 pm- Forum: Data Sufficiency
- Topic: Finding "N"
- Replies: 4
- Views: 2220
Since x + y >0, both x and y cannot be -ve. Also when one of them is +ve and the other -ve, the +ve number has to be numerically greater than the -ve. now let us take (1) x >y. If both x and y are +ve then, since x > y, x > |y|. let one of them be -ve. Since x > y, x has to be +ve and y has to be -v...
- by manred
Tue Jul 10, 2007 7:00 pm- Forum: Data Sufficiency
- Topic: DS: BTG set Section 7
- Replies: 1
- Views: 1620
thanks everybody for the clarification. Just a note that a few resources on the internet claim zero to be neither even nor odd. They have their own valid reasoning which cannot be ignored though.
- by manred
Tue Jul 10, 2007 5:59 pm- Forum: Data Sufficiency
- Topic: Need clarification on a simple concept!!
- Replies: 4
- Views: 2163
Search doesnt clarify
I have done some search on the web and still the ocnfusion remains. Some resources say that zero is even and the others claim it is neither even nor odd. But the majority says its even. Yes, zero has been a topic of debate for mathematicians since ages and still is. But right now Iam only concerned ...
- by manred
Mon Jul 09, 2007 9:32 pm- Forum: Data Sufficiency
- Topic: Need clarification on a simple concept!!
- Replies: 4
- Views: 2163
Need clarification on a simple concept!!
This is a DS question from PR Math Bin 1. What is the value of x? (1) x^2 = 4x (^ is my representation of to the power of) (2) x is an even integer. The choice are standard DS choices. My answer was (C) BOTH statements together are sufficient but NEITHER statement alone is sufficient. My solution is...
- by manred
Mon Jul 09, 2007 9:11 pm- Forum: Data Sufficiency
- Topic: Need clarification on a simple concept!!
- Replies: 4
- Views: 2163
- by manred
Thu Feb 15, 2007 1:32 pm- Forum: GMAT Essays (AWA)
- Topic: How much can this fetch me? (Analysis of Argument)
- Replies: 15
- Views: 10023
Hi, this is my first post on the forum. Have been visiting the forum for quite some time though. Not a very good writer myself but I have few point to make after reading the essay. The essay has got a structure, great coherence and is very logically written. But the writnig style has been too predic...
- by manred
Wed Feb 14, 2007 8:39 pm- Forum: GMAT Essays (AWA)
- Topic: How much can this fetch me? (Analysis of Argument)
- Replies: 15
- Views: 10023