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![[#12] 2 Min. Challenge: Even](/forum/styles/gmatclub_light/imageset/icon_post_target_unread.svg "[#12] 2 Min. Challenge: Even"){kind=icon}
08 Mar 2004, 21:45
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1. Time yourself
2. Solve this problem on a sheet of paper [ under 2 mins, if possible]
3. type in your solution and the time, if possible.
a, b, c are integers. Is (a*b*c)! even?
(1) a^2-5a=-6
(2) bc>0
1. Time yourself
2. Solve this problem on a sheet of paper [ under 2 mins, if possible]
3. type in your solution and the time, if possible.
a, b, c are integers. Is (a*b*c)! even?
(1) a^2-5a=-6
(2) bc>0
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08 Mar 2004, 21:55
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Ans: E
From A) a = 3 or -2 NOT SUFF
From B) bc > 0 ; a is not given; NOT SUFF
From A & B ; bc > 0 and a =3 or -2.
so a * b * c could be postive integer or negative integer << NOT SUFF
Thus, answer E
From A) a = 3 or -2 NOT SUFF
From B) bc > 0 ; a is not given; NOT SUFF
From A & B ; bc > 0 and a =3 or -2.
so a * b * c could be postive integer or negative integer << NOT SUFF
Thus, answer E
09 Mar 2004, 05:49
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A) not sufficient because a = 2 or a = 3 and any one of b and c could be 0
B) not sufficient because a could be zero.
Combine you get abc > 1 .A factorial of any number > 1 is always even
C should be the answer.
B) not sufficient because a could be zero.
Combine you get abc > 1 .A factorial of any number > 1 is always even
C should be the answer.
