Question:
The law \( a + b = b + a \) is called:
- (a) Closure law
- (b) Associative law
- (c) Commutative law
- (d) Distributive law
Solution:
The expression
\[ a + b = b + a \]
means that changing the order of operands does not change the result.
This property is known as the commutative law.
Example:
\[ 3 + 5 = 5 + 3 = 8 \]
—Final Answer:
\[ \boxed{\text{(c) Commutative law}} \]