Which argument is valid?
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which argument is valid?
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a. if a polygon is a square, it has four right angles.
if a polygon is a rectangle, then it has four right angles.
if a polygon is a rectangle, then it is a square.
b. if a number is divisible by 12, then it is divisible by 6.
if a number is divisible by 6, then it is divisible by 2.
if a number is divisible by 12, then it is divisible by 2
c. if it is a dog, then it barks.
if it has a tail, then it is an animal.
if it is a dog, then it barks and has a tail.
d. if an animal can swim, then it has fins.
if an animal is a fish, then it has fins.
if an animal can swim, then it is a fish.