Question Details

2 × 4 × 8 × 16 ( log2 4 )2 ( log4 8 )3 ( log8 16 )4   equals

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Correct Answer :

24

Solution :

The correct answer is 24.

To find the value of the given expression, we can simplify the numerator and denominator separately.

Step 1: Simplify the Numerator
The numerator is a simple multiplication of numbers:

Numerator = 2 × 4 × 8 × 16
Let us compute this product:

2 × 4 = 8
8 × 8 = 64
64 × 16 = 1024
Thus, the numerator is equal to 1024.

Step 2: Simplify the Denominator
The denominator consists of three logarithmic terms raised to different powers:

Denominator = ( log 2 4 ) 2 ( log 4 8 ) 3 ( log 8 16 ) 4
Let us evaluate each term individually using the change of base rule or power rule of logarithms: log a b ( c d ) = d b log a c .

1) For the first term:

log 2 4 = log 2 ( 2 2 ) = 2
Raising this to the power of 2:

( log 2 4 ) 2 = 2 2 = 4

2) For the second term:

log 4 8 = log 2 2 ( 2 3 ) = 3 2
Raising this to the power of 3:

( log 4 8 ) 3 = ( 3 2 ) 3 = 27 8

3) For the third term:

log 8 16 = log 2 3 ( 2 4 ) = 4 3
Raising this to the power of 4:

( log 8 16 ) 4 = ( 4 3 ) 4 = 256 81

Now, multiply these three evaluated terms to find the total denominator:

Denominator = 4 × 27 8 × 256 81
We can simplify this fraction multiplication:

Denominator = ( 4 8 ) × ( 27 81 ) × 256
Denominator = 1 2 × 1 3 × 256 = 256 6 = 128 3

Step 3: Calculate the Final Value
Now, substitute the simplified numerator and denominator back into the main expression:

Value = 1024 ( 128 3 )
Multiply the numerator by the reciprocal of the denominator:

Value = 1024 × 3 128
Since 1024÷128=8, we have:

Value = 8 × 3 = 24

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