- #1

willmac

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a. All the magnitudes must be equal.

b. One of the magnitudes must be greater than the sum of the other two.

c. One of the magnitudes must be at least twice as great as each of the other two.

d. One of the magnitudes must be less than the difference of the other two.

e. The sum of two of the magnitudes must be greater than or equal to the third for all three vectors.