B2cd, _____, bcd4, b5cd, bc6d

General
1

b2cd, _____, bcd4, b5cd, bc6d

2

LectureNotes said b2cd, _____, bcd4, b5cd, bc6d

Answer: It seems like the missing word or number between “b2cd” and “bcd4” is “b3cd”. Therefore, the sequence would be: b2cd, b3cd, bcd4, b5cd, bc6d.