Choose appropriate number for the fourth place.

$2 : 16 :: 4 : ?$

64

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128

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256

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512

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Solution

The correct option is C $256$
Given that:
$2 : 16 :: 4 : ?$

Now,
$2 : 16 = 2 : 2^{4}$

Similarly, we can write
$4 : 4^{4} = 4 : 256.$

Hence, the appropriate number for the fourth place is $256.$

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