Operators

Question 1
The operation which is commutative but not associative is:  
A
AND
B
OR
C
EX-OR
D
NAND
       Digital-Logic-Design       Operators       Gate-1992
Question 1 Explanation: 
NAND and NOR operation follow commutativity but do not follow associativity.
Question 2
All digital circuits can be realized using only
A
Ex-OR gates
B
Multiplexers
C
Half adders
D
OR gates
E
Both B and C
       Digital-Logic-Design       Operators       Gate-1992
Question 2 Explanation: 
NOR gate, NAND gate, Multiplexers and Half adders can also be used to realize all digital circuits.
There are 2 questions to complete.