Which of the following metals crystallizes in a hexagonal close-packed $(hcp)$ structure?

The stacking pattern in a body-centered cubic $(bcc)$ lattice is of the type............

The number of tetrahedral and octahedral voids in a $CCP$ unit cell are respectively:

In a face-centred cubic lattice,atom $A$ occupies the corner positions and atom $B$ occupies the face-centred positions. If one atom of $B$ is missing from one of the face-centred points,the formula of the compound is

$A$ crystalline solid $XY_3$ has a $ccp$ arrangement for its element $Y$. $X$ occupies:

The ratio of close-packed atoms to tetrahedral holes in cubic close packing is