Quotient-3 Cordial Labelling For Cycle Related Graphs

: Let G be a graph of order p and size q. Let f: V (G) Z4 – {0} be a function. For each E (G) define f*: E (G) Z3 by f*(uv) = (mod 3) where f (u) f (v). If the number of vertices having label i and the number of vertices having label j differ by maximum 1, the number of edges having label k and the number of edges having label l differ by maximum 1 then the function f is said to be quotient-3 cordial labeling of G. 1 ≤ i, j ≤ 3, i and 0 ≤ k, l ≤ 2, k l. Here we proved that Cn and some cycle related graphs like [Cn ; C3], n=3,6,9,…, (P2 mk1) + N2 , S (Cn ; S2), joint sum of Cn and two cycles Cn having a common vertex is quotient-3 cordia