Answer
$12D$
Work Step by Step
We use the hexadecimal addition table 16.3 on page 560 to obtain:
$$
C3+6A=12D
.$$
Check, using decimals: $C3_{16}=195 _{10}, \ 6A_{16}=106_{10} $
$$
195 +106=301, \\
12D_{16}=1\times 16^2+2\times 16+13\times16^0= 301
.$$