Should I use "probabilities" or "probability" in the following sentence?

Consider a probability vector v containing the probabilities of jumping to each vertex.

  • 3
    This appears to be a fragment, not a sentence; and it's not clear which word you are asking about -- is it the first "probability" or the second "probabilities" you are considering?
    – Andrew Leach
    Jun 6, 2012 at 23:35
  • 3
    @AndrewLeach 'consider' is imperative.
    – Mitch
    Jun 7, 2012 at 0:04
  • are the probabilities (the coordinates of the vector presumably) distinct or are they all identical?
    – Mitch
    Jun 7, 2012 at 0:05
  • my problem is about the second probabilities. Each vertex has a probability and they are placed in vector v. Should I use probabilities?
    – Shayan
    Jun 7, 2012 at 0:14

2 Answers 2


For each vertex, there's only one probability. So you should say "... containing the probability of jumping to each vertex".


Since a probability vector is a nonnegative vector whose coordinates sum to 1 ... If that is what you are talking about "a probability vector" would do it. It's much more a maths question .

edit: following your edit, it's more clear (it initially looked like your v was standing for versus), then, since in a probability vector there are several probabilities, the plural is ok for the second occurrence.

edit #2: I guess you are talking about being in one given vertex, which is associated to a vector giving the probabilities for going to one of the other vertices, right ?

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