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by aneesh.kg » Wed Apr 18, 2012 5:57 am
Square root of 4 = 2
Cube root of 4 = 1.6 (approximately, 1.6^2 is 2.56 and 2.56*1.6 is around 4)
Fourth Root of 4 = 1.4 (approximately, because 1.4^2 is approximately 2 and 2^2 is 4)

So, M = 5 (approx)

(E) is the answer.
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by sam2304 » Wed Apr 18, 2012 6:08 am
4^1/2 + 4^1/3 + 4^1/4

Take the common smallest value from the powers

1/4(2 + 4/3 + 1)
1/4(13/3)
13/12
1.xx
4^1.xx > 4

Is this approach right ? I got a bit confused with taking common values.
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