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Question 163
For any two real numbers:
a + b = 1 if both a and b are positive or both a and b are negative.
a + b = -1 if one of the two numbers a and b is positive and the other negative.
What is (2 + 0) + (-5 + -6)?
A. a + b is zero if a is zero
B. a + b = b + a
Solution
We have (2 + 0) + (-5 + -6)
Now using statement B it can be written as (0 + 2) + (-5 + -6).
Using trhe statement A we can get the answer to the required question.
Hence,the question can be answered by using both the statements together, but cannot be answered by using either statement alone.
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