Select the option that is related to the third number in the same way as the second number is related to the first number.
13 : 84.5 :: 20 : ......
$$ 13Â :Â \frac{13^{2}}{2} = 84.5$$
$$ 20 :Â \frac{20^{2}}{2} = 200$$
Option D is correct.
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