When did this amendment take effect?
The given context does not specify a date when the amendment took effect. However, it mentions that the nomination provisions for the Anglo-Indian community in the House of the People and Legislative Assemblies would cease to have effect on the expiration of a period of eighty years from the commencement of the Constitution, which was January 26, 1950. So, it can be deduced that this amendment's impact will cease in 2030 (80 years from 1950) for clause (a) and in 2020 (70 years from 1950) for clause (b).