Let G be a graph with 7 vertices, where each vertex is labelled by a number from 1 to 7. Two vertices are selected at random. Let us call them u and v. Now, directed edges are drawn from u to all other vertices except v and directed edges are drawn from all vertices to v except from u. Let x be the total possible topological sortings of G. hint: You may remember the terms factorials or fibonacci? Write down the value of x:

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Let G be a graph with 7 vertices, where each
vertex is labelled by a number from 1 to 7. Two
vertices are selected at random. Let us call them
u and v. Now, directed edges are drawn from u to
all other vertices except v and directed edges are
drawn from all vertices to v except from u. Let x
be the total possible topological sortings of G.
hint: You may remember the terms factorials or
fibonacci?
Write down the value of x:

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