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chaitanyabhansali
- Junior | Next Rank: 30 Posts
- Posts: 20
- Joined: Sun Apr 17, 2011 7:16 am•Followed by: 1 member
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$0 to start
then $127/mo
DS !!
Source: Beat The GMAT — Problem Solving |
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MAAJ
- Master | Next Rank: 500 Posts
- Posts: 243
- Location: Dominican Republic
- Thanked: 31 times
- GMAT Score:480
Is cdef < 0?
c d^2 e^3 f^4 < 0
(?) (+/-) (?) (+/-) < 0
This only tell us that c and e have different sign, not sufficient.
2) c^2 d^3 e^4 f^5 > 0
(+/-) (?) (+/-) (?) > 0
This only tell us that d and f have the same sign, not sufficient.
3) Combined:
c and e have different sign, thus their product will be (negative)
d and f have the same sign, thus their product will be (positive)
(negative) * (positive) < 0
c d e f <0
Sufficient
c d^2 e^3 f^4 < 0
(?) (+/-) (?) (+/-) < 0
This only tell us that c and e have different sign, not sufficient.
2) c^2 d^3 e^4 f^5 > 0
(+/-) (?) (+/-) (?) > 0
This only tell us that d and f have the same sign, not sufficient.
3) Combined:
c and e have different sign, thus their product will be (negative)
d and f have the same sign, thus their product will be (positive)
(negative) * (positive) < 0
c d e f <0
Sufficient
"There's a difference between interest and commitment. When you're interested in doing something, you do it only when circumstance permit. When you're committed to something, you accept no excuses, only results."
