The answer is A for 1. And C for 2.
Hope this helps.
Answer:
the mistake is in the first statement.
Explanation:
Now lets us put the statement into consideration:
"The sum of any two rational numbers is irrational"
The negation is: " there exists a pair of rational numbers whose sum is irrational". (Existence of at least one of such a pair).
The negation is not "the sum of any two rational numbers is irrational"
Therefore the mistake is in the first statement and it is due to incorrect negation of the proof.
