THE FORMULA FOR CROMATIC NUM OF CYCLIC GRAPH IS
N - 2(FLOOR(N/2)) + 2
EG : FOR TRIANGLE(3 CYCLE) WE NEED 3 COLOUR AND FORMULA GIVES 3(PUT N=3)
FOR SQUARE(4 CYCLE) WE NEED =2 COLOURS AND FORMULA GIVES 2
FOR 149 IT WILL BE
149-2(FLOOR(149/2))+2
=149-2*74 +2 =149-148+2=3