$2\mathrm{.}26$ You wish to express $-64$ as a $2\text{'}$s complement number.

a$.$ How many bits do you need $($the minimum number$)?$

b$.$ With this number of bits, what is the largest positive number you can

represent? $($Please give answer in both decimal and binary.$)$

c$.$ With this number of bits, what is the largest unsigned number you can

represent? $($Please give answer in both decimal and binary.$)$