Ratio of k in Barabasi-Albert model

In a Barabási-Albert model with m = 2, node A is added at time tA= 1 and node B at time tB = 4, as illustrated in the Figure. Here tA and tB are the birth times ti of each node. What is the ratio kA(100) / kB(100)?

t k 0 5 10 15 20 1 4 25 50 100 node B enters (tB=4) node A (tA=1) kA(100) kB(100)
  1. 1/2
  2. 1
  3. 4
  4. 10
  5. None of the above

Original idea by: Gustavo P. C. P. da Luz

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