The logic gate combination circuit shown in the figure performs the logic function of

In semiconductors at room temperature,

The logic circuit in figure is equivalent to

In an NPN transistor $10^{10}$ electrons enter the emitter in $10^{-6} \mathrm{~s}$ and $2 \%$ electrons recombine with holes in base. The current ratios ' $\alpha$ ' and ' $\beta$ ' of a transistor are respectively (nearly)