Select the option that is related to the third numberin the same way as the second numberis related to the first number and the sixth numberis related to the fifth number.
6: 16 :: 20 : ? :: 11 : 81
6 - 2 = 4
$$(4)^2 = 16$$
11 - 2 = 9
$$(9)^2 = 81$$
Similarly,
20 - 2 = 18
$$(18)^2 = 324$$
$$\therefore$$ The correct answer is option B.
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