Number of atom per unit cell in B.C.C.

For a transistor $${{{I_C}} \over {{I_E}}}$$ = 0.96, then current gain for common emitter is

In a p-n junction

The given truth table is for which logic gate

              $$\matrix{ A & B & Y \cr 1 & 1 & 0 \cr 0 & 1 & 1 \cr 1 & 0 & 1 \cr 0 & 0 & 1 \cr } $$