Solution
The third digit is the average of the first two digits.
$$\frac{(2+4)}{2}=\frac{6}{2}=3$$
$$\frac{(6+8)}{2}=\frac{14}{2}=7$$
$$\frac{(9+7)}{2}=\frac{16}{2}=8$$
$$\frac{(4+5)}{2}=\frac{9}{2}=4.5\neq6$$
=> Ans - (D)
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