Q.

Consider the system of equations log3⁡log2⁡x+log1/3⁡log1/2⁡y=1 and xy2=9The value of x lies in the intervalThe value of  1/y lies in the interval

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a

(200, 300)

b

(400, 500)

c

(700, 800)

d

none of these

e

(5, 7)

f

(7 , 10)

g

( 11, 15)

h

(25, 30)

answer is , .

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Detailed Solution

log3⁡log2⁡x+log1/3⁡log1/2⁡y=1⇒ log3⁡log2⁡x−log3⁡−log2⁡y=1⇒ log3⁡−log2⁡xlog2⁡y=1⇒ −log2⁡xlog2⁡y=3⇒ xy3=1 Also, xy2=9⇒ y=19∴ x=729 log3⁡log2⁡x+log1/3⁡log1/2⁡y=1⇒ log3⁡log2⁡x−log3⁡−log2⁡y=1⇒ log3⁡−log2⁡xlog2⁡y=1⇒ −log2⁡xlog2⁡y=3⇒ xy3=1 Also, xy2=9⇒ y=19∴ x=729
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