If p=a+bω+cω2; q=b+cω+aω2 and r=c+aω+bω2, where a,b,c≠0 and ω is the non-real complex cube root of unity, then:
If ω is a complex cube root of unity, then the value of a+bω+cω2c+aω+bω2 + a+bω+cω2b+cω+bω2 is :