The greatest of $$\sqrt 2 ,$$ $$\root 6 \of 3 ,$$ $$\root 3 \of 4 ,$$ $$\root 4 \of 5 $$ is = ?
A. $$\sqrt 2 $$
B. $$\root 3 \of 4 $$
C. $$\root 4 \of 5 $$
D. $$\root 6 \of 3 $$
Answer: Option B
Solution(By Examveda Team)
LCM of 2, 3, 4, 6 is 12$$\sqrt 2 = $$ $${2^{\frac{1}{2}}} = $$ $${2^{\left( {\frac{1}{2} \times \frac{6}{6}} \right)}} = $$ $${2^{\frac{6}{{12}}}} = $$ $${\left( {{2^6}} \right)^{\frac{1}{{12}}}} = $$ $${\left( {64} \right)^{\frac{1}{{12}}}} = $$ $$\root {12} \of {64} $$
$$\root 6 \of 3 = $$ $${3^{\frac{1}{6}}} = $$ $${3^{\left( {\frac{1}{6} \times \frac{2}{2}} \right)}} = $$ $${3^{\frac{2}{{12}}}} = $$ $${\left( {{3^2}} \right)^{\frac{1}{{12}}}} = $$ $${\left( 9 \right)^{\frac{1}{{12}}}} = $$ $$\root {12} \of 9 $$
$$\root 3 \of 4 = $$ $${4^{\frac{1}{3}}} = $$ $${4^{\left( {\frac{1}{3} \times \frac{4}{4}} \right)}} = $$ $${4^{\frac{4}{{12}}}} = $$ $${\left( {{4^4}} \right)^{\frac{1}{{12}}}} = $$ $${\left( {256} \right)^{\frac{1}{{12}}}} = $$ $$\root {12} \of {256} $$
$$\root 4 \of 5 = $$ $${5^{\frac{1}{4}}} = $$ $${5^{\left( {\frac{1}{4} \times \frac{3}{3}} \right)}} = $$ $${5^{\frac{3}{{12}}}} = $$ $${\left( {{5^3}} \right)^{\frac{1}{{12}}}} = $$ $${\left( {125} \right)^{\frac{1}{{12}}}} = $$ $$\root {12} \of {125} $$
Clearly $$\root {12} \of {256} \,\,i.e.,\root 3 \of 4 $$ is the greatest.
Related Questions on Surds and Indices
A. $$\frac{1}{2}$$
B. 1
C. 2
D. $$\frac{7}{2}$$
Given that 100.48 = x, 100.70 = y and xz = y2, then the value of z is close to:
A. 1.45
B. 1.88
C. 2.9
D. 3.7
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