Let G be a complete undirected graph on 6 vertices If vertices of G are labeled then the number of distinct cycles of length 4 in G is equal to gate computer science 2012

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Let G be a complete undirected graph on 6 vertices. If vertices of G are labeled, then the number of distinct cycles of length 4 in G is equal to -gate-computer science-2012

Let G be a complete undirected graph on 6 vertices. If vertices of G are labeled, then the
number of distinct cycles of length 4 in G is equal to
 (A) 15 (B) 30 (C) 90 (D) 360 


By:Amogh

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Answer: (C) 45

Explanation: There can be total 6C4 ways to pick 4 vertices from 6. The value of 6C4 is 15.

Note that the given graph is complete so any 4 vertices can form a cycle.

There can be 6 different cycle with 4 vertices. For example, consider 4 vertices as a, b, c and d. The three distinct cycles are

cycles should be like this
(a, b, c, d,a)
(a, b, d, c,a)
(a, c, b, d,a)
(a, c, d, b,a)
(a, d, b, c,a)
(a, d, c, b,a)

and

(a, b, c, d,a) and (a, d, c, b,a)
(a, b, d, c,a) and (a, c, d, b,a)
(a, c, b, d,a) and (a, d, b, c,a)
are same cycles.

So total number of distinct cycles is (15*3) = 45.

milan-ransingh

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