$13 (168) 13, 14 (181) 13, 15 (?) 13$ .

196

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195

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190

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194

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Solution

The correct option is D $194$
The pattern is as follows.
$13 (168) 13 \Rightarrow 13 \times 13 = 169 - 1 = 168$ (Middle number)
$14 (181) 13 \Rightarrow 14 \times 13 = 182 - 1 = 181$ (Middle number)
and $15 (?) = 13 \Rightarrow 15 \times 13 = 195 - 1 =$
$194$
(Middle number).

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