The function d defined by d(p, q) = ||p - q||, p and q are vectors in a normed vector space V, 

1
is a metric on V.
2
is not a metric on V.
3
d(p, q) ≥ d(p, q) + d(r, q).
4
d(p, q) ≤ d(p, r) + d(q, r).

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