Answer
$1111111$
Work Step by Step
Replace each hexadecimal digit with its equivalent 4-digit binary form. Add zeroes to the front of the binary value if necessary to create a 4-digit number.
$7_{16}=7_{10}=2^2+2^1+2^0=111_2=0111_2$
$F_{16}=15_{10}=2^3+2^2+2^1+2^0=1111_2$
$\ \ \ \ 7\ \ \ \ \ \ F$
$\overbrace{0111}\ \overbrace{1111}$
