x^4 + y^4

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aatech: Master | Next Rank: 500 Posts; Posts: 192; Joined: Tue Apr 29, 2008 7:41 am; Thanked: 14 times

by aatech » Sat May 31, 2008 11:20 am

Is x^4 + y^4 > z^4

1) x^2 + y^2 > z^2
2) x+y > z

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Source: Beat The GMAT — Data Sufficiency | Sat May 31, 2008 11:20 am

netigen: Legendary Member; Posts: 631; Joined: Mon Feb 18, 2008 11:57 pmFollowed by: 3 members; Thanked: 29 times

by netigen » Sat May 31, 2008 12:18 pm

Ans is E

Best way is to plug numbers

x=y=z =1 we get yes
x=3 y=3 and z=4 we get no

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aatech: Master | Next Rank: 500 Posts; Posts: 192; Joined: Tue Apr 29, 2008 7:41 am; Thanked: 14 times

by aatech » Sat May 31, 2008 12:41 pm

Yes, OA is E

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