Add the following numbers in binary using Zs complement to represent negative numbers. Use a word length of 6 bits (including sign) and indicate if an overflow occurs.
(a) 21 + 11
(b) (-14) + (-32)
(c) (-25) + 18
(d) (-12) + 13
(e) (-11) + (-21)

Repeat (a). (c). (d). and (e) using s complement to represent negative numbers.