Comp232 - Mathematics For Computer Science - Ali Moallemi, Iraj Hedayati - Concordia University Page 11

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Exercise 20
Determine whether these are valid arguments.
2
a)
If x is a positive real number, then x
is a positive real number.
2
Therefore, if a
is positive, where a is a real number, then a is a
positive real number.
Answer:
Invalid
2
b)
If x
= 0, where x is a real number, then x = 0. Let a be a real
2
number with a
= 0 ; then a = 0.
Answer:
Valid
Ali Moallemi, Iraj Hedayati
COMP232 - Mathematics for Computer Science
11 / 18

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