Alpha–numeric series completion: identify the missing term in B2CD, _____, BCD4, B5CD, BC6D by tracking digit progression and shifting digit position

Given data

• Series: B2CD, _____, BCD4, B5CD, BC6D.

Concept/Approach (why this method)

Two patterns run simultaneously: (i) the number increases by 1 each step (2,3,4,5,6); (ii) the position of the number cycles through the 2nd→3rd→4th characters, then repeats.

Step-by-Step calculation
1) Term 1: B2CD (number in 2nd position).2) Term 2 (missing): number should be 3 and shift to 3rd position ⇒ BC3D.3) Term 3: BCD4 (4th position).4) Term 4: B5CD (cycle repeats to 2nd position).5) Term 5: BC6D (3rd position).

Verification/Alternative

Positions follow the loop (2→3→4→2→3), and the digits are 2,3,4,5,6 in order — consistent.

Common pitfalls

• Placing the '3' in the second position, breaking the positional cycle.

Final Answer
BC3D