Yes, you can pursue a three-year, full-time LLB programme after pursuing the BA programme from the open university or college. Most of the colleges in India offering a three-year LLB programme accepts application from candidates who have done their Bachelor's degree from an open university subject to the condition that the open university or college is a recognised university. Therefore, if you have competed your BA degree from a recognised open university, then you can apply for admission to the LLB programme.