Select the missing number ?
2 2 8
3 3 18
4 4 ?
The pattern followed here is,
Square of 1st digit is added to the square of 2nd digit.
$$ 2^{2} + 2^{2} = 8$$
$$ 3^{2} + 3^{2} = 18$$
$$ 4^{2} + 4^{2} = 32$$
Hence, option D is the correct answer.
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