Given that, \( \Large \left(2^{4 \times \frac{1}{2}}\right)^{?} = 256 \) => \( \Large \left(2^{2}\right)^{?} = 2^{8} => 2 \times ? = 8 \) Therefore, \( \Large ? = \frac{8}{2} = 4 \)
