In the following circuit, what are P and Q?

In a CE amplifier, the input AC signal to be amplified is applied across

If $A=1$ and $B=0$, then in terms of Boolean algebra, $A+\bar{B}=$

The density of electron-hole pair in a pure germanium is $3 \times 10^{16} \mathrm{~m}^{-3}$ at room temperature. On doping with aluminium, the hole density increases to $4.5 \times 10^{22} \mathrm{~m}^{-3}$. Now, the electron density (in $\mathrm{m}^{-3}$ ) in doped germanium will be