21.
Addition is associative for
A
Natural numbers
B
Whole Numbers
C
Rational Numbers
D
All of these
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Addition is associative for
Natural numbers
Whole Numbers
Rational Numbers
All of these
A number of the form p/q is said to be a rational number if
p and q are integers
p and q are integers and p is not qual to zero.
p and q are integers and q is not qual to zero.
p and q are integers and p and q both are not equal to zero.
-(-x) is same as
-x
x
1/x
-1/x