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IMAS 2024/2025 Upper Primary Division - First Round Question 9

IMAS · IMAS 2024/2025 Upper Primary Division - First Round

Question 9

A machine transmits messages that consist only of the letters A, B, C, D and E. Before the machine sends a message, A is encoded as 11, B as 10, C as 011, D as 010 and E as 00. For example, the message CABDE is encoded as 011111001000. If this machine sent 100111010111100010, what was the message?
  1. BCBBBADE
  2. BCBBAABD
  3. BCBBAEAD
  4. BCBBAAED
  5. BCAABBED