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Is the product of a and b odd? (1) a has only 2 factors (2)

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Is the product of a and b odd? (1) a has only 2 factors (2) [#permalink] New post 10 Sep 2006, 13:47
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Is the product of a and b odd?

(1) a has only 2 factors

(2) b = 2x + 1, where x is an integer
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Re: DS - A and B [#permalink] New post 10 Sep 2006, 13:55
ps_dahiya wrote:
Is the product of a and b odd?

(1) a has only 2 factors

(2) b = 2x + 1, where x is an integer


1) is not SUFF as it looks like a prime number. Since 2 is also prime product may be even also.

2) itself is not suff though b looks a odd #.

Again taking both includes 2 from the set of numbers 1) has got.

So it is E
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 [#permalink] New post 10 Sep 2006, 14:05
(E) also and as desmontrated by trivikram.
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 [#permalink] New post 10 Sep 2006, 14:18
It was never said if a,b are intigers so i am not sure of that but

for a product of two intigers to be even we only need to know whether onr of them is even or not

from one

all prime numbers has two factors and all are odd except 2...insuff

from two b is always odd intiger and we have no info about a ...insuff

both together ab could be even*odd or odd*odd....insuff

E is my answer
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 [#permalink] New post 10 Sep 2006, 15:06
yezz wrote:
It was never said if a,b are intigers so i am not sure of that but

for a product of two intigers to be even we only need to know whether onr of them is even or not

from one

all prime numbers has two factors and all are odd except 2...insuff

from two b is always odd intiger and we have no info about a ...insuff

both together ab could be even*odd or odd*odd....insuff

E is my answer


Very good point yezz......a and b need not be integers but the both the premises would lead you to believe they are ints....I may be wrong here :roll:
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 [#permalink] New post 10 Sep 2006, 18:54
straight E. here is the demolition.. :)

from problem statement:

a,b belong to set R

Is a.b odd?

If a,b belong to I, then we need to find if either a or b is even

1. a has only 2 factors.....
only makes sense if a is a prime number....may be even (2) or odd(3.....)
INSUFF

2. b is an odd integer...
INSUFF

combining, ab could be an even integer or an odd integer.
E
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 [#permalink] New post 14 Sep 2006, 09:19
Dahiya OA and OE if u please :lol:
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 [#permalink] New post 14 Sep 2006, 09:31
i think it will be some time before psd returns with the answers....he is out painting the town red after his 700 :)
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 [#permalink] New post 14 Sep 2006, 09:37
:wave :musband :done THIS IS GREAT GREAT GREAT NEWS

This guy deserves all the best in anythion he wants... such a helfull person

he is a math guru for sure he is ... my fear is whether we are going to loose his efforts and help on the forum or not

any ways i am really happy for that man
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 [#permalink] New post 14 Sep 2006, 09:50
Thanks guys.

OA is E. You guys rock. This was the only question I got wrong in MGMAT3.
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  [#permalink] 14 Sep 2006, 09:50
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