Perform the following operations in the specified base and representation $($do not convert to Decimal$)$ and show all details $($carries$)$ and specify whether there is an overflow or not:

a$.(10010)2+(10010)2($assuming that the numbers are signed and are in $2$s complement signed$)$

b$.(10010)2+(10010)2($assuming that the numbers are usigned$)$

c$.(1$F$)16+($E$1)16($assuming that the numbers are usigned$)$