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syflysun: Junior | Next Rank: 30 Posts; Posts: 28; Joined: Sat Jul 04, 2009 3:55 am

by syflysun » Tue Sep 08, 2009 7:53 am

between 1-100, which number has both perfect square root and perfect cubic root?

64

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Source: Beat The GMAT — Problem Solving | Tue Sep 08, 2009 7:53 am

bharathh: Master | Next Rank: 500 Posts; Posts: 159; Joined: Thu Aug 27, 2009 10:30 am; Thanked: 19 times

by bharathh » Tue Sep 08, 2009 8:43 am

64

It's a very imp number

So is 81

64 = 8^2 = 4^3 = 2^6

81 = 9^2 = 3^4

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