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If x,y, and z are positive integers such that 0 < x < [#permalink]
27 May 2005, 15:02
00:00
A
B
C
D
E
Difficulty:
(N/A)
Question Stats:
100% (01:24) correct
0% (00:00) wrong based on 0 sessions
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If x,y, and z are positive integers such that 0 < x < y < z and x is even, y is odd, and z is prime, which of the following is a possible value of x + y + z ?
Re: PS, 700+ level [#permalink]
27 May 2005, 17:56
sparky wrote:
If x,y, and z are positive integers such that 0 < x < y < z and x is even, y is odd, and z is prime, which of the following is a possible value of x + y + z ?
A) 6 B) 11 C)19 D) 26 E) 29
to minimize the time, use POE first. so eliminate B, C and E because x + y + z cannot be odd integer.
then, plug in. using plugging in, you can easily eliminate A because 6 is smaller than the required integer. so D (26) is the only possible integer.
Re: PS, 700+ level [#permalink]
28 May 2005, 02:35
sparky wrote:
If x,y, and z are positive integers such that 0 < x < y < z and x is even, y is odd, and z is prime, which of the following is a possible value of x + y + z ?
A) 6 B) 11 C)19 D) 26 E) 29
Sorry guys, saw this thread late, but thought would chip in with my thoughts. My 2 cents on this one -
Min x = 2. Min y = 3. Min z = 2. Thus x + y + z >= 7. Thus A is ruled out.
You can start a process of elimination by considering the primes. Basic requirement is this:
Subtract a prime from the given option, and your answer should be odd.
If this hits, then the prime should be greatest of the three numbers.
Since odd number - prime would always be even (unless the prime is 2, which is smallest number, so inadmissible) - since all other primes are odd, no odd number can be the answer.
Thus 26.
Btw Sparky, POE is Process of Elimination (unless I am grossly mistaken ) _________________