2 votes 2 votes Let a,b,c,d are 4 consecutive numbers of Fibonacci series. Prove or dis-approve ad-bc= ±1 Now my question is can we prove it by induction? Aboveallplayer asked Nov 2, 2016 Aboveallplayer 475 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply Nitesh Methani commented Nov 3, 2016 reply Follow Share can u post your proof by induction ? 0 votes 0 votes Arjun commented Nov 3, 2016 reply Follow Share yes, induction proof is valid. 0 votes 0 votes Please log in or register to add a comment.