## Discussion Forum

Que. | A graph is self-complementary if it is isomorphic to its complement. For all self-complementary graphs on n vertices, n is |

a. | A multiple of 4 |

b. | Even |

c. | Odd |

d. | Congruent to 0 mod 4, or 1 mod 4 |

Answer:Congruent to 0 mod 4, or 1 mod 4 |