Which option will replace the '?'
\(B_2CD, BC_3D, ? , B_5CD, BC_6D\)
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → \(BCD_4\)
Every term has the letters B, C, D in the same order; only the number changes. It goes up by 1 each time and moves one letter to the right, starting again at B after D:
\(B_2CD\): 2 on B
\(BC_3D\): 3 on C
Missing term: 4 on D, that is, \(BCD_4\)
\(B_5CD\): 5 back on B
\(BC_6D\): 6 on C