0 0 votes Combinatory ace-test-series discrete-mathematics recurrence-relation + – Sinchit 1.7k views answer comment Share Follow Print See 1 comment 1 1 comment reply prashant jha 1 commented Jan 6, 2019 reply Follow flag substitution with n=1 gives the answer :P 0 0 replyShare Please log in or register to add a comment.