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sqaure n cube root

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Source: — Problem Solving |

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by Brent@GMATPrepNow » Fri Aug 07, 2015 6:14 pm
rommysingh wrote:if M= Sqrt(4) + third root(4) + Fourth root (4) then M is

A. Less than 3
B. Greater then 3
C. Between 3 and 4
D. Equal to 4
E. Greater than 4
The square root of 4 = 2

The cube root of 4
The cube root of 1 = 1
The cube root of 8 = 2
So, the cube root of 4 is between 1 and 2.
In other words, the cube root of 4 = 1.something

The fourth root of 4
The fourth root of 1 = 1
The fourth root of 16 = 2
So, the fourth root of 4 is between 1 and 2.
In other words, the fourth root of 4 = 1.something

TOTAL SUM = 2 + 1.something + 1.something
= more than 4
= E

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Brent
Brent Hanneson - Creator of GMATPrepNow.com
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