In clue 2 (code 2 1 6 9), both 6 and 9 are wrong. Consequences of both of the digits 1 and 2 to be right Consequence analysis in a linked series of possibilities should give us the first breakthrough.Īs digits 1 and 2 occur together in three codes, we will analyze it first. Next, we can analyze the consequence of both 6 and 9 to be wrong in clue 3 (code 3 6 9 4). This is because, we can conclude both 6 and 9 to be wrong when in rule 2 (code 2 1 6 9) both 1 and 2 are right.

These significant patterns should be the key to discovering right and wrong digits. The pair of digits 1-2 occur together in three of the five codes and the pair 6-9 appear in two of the five codes. Solution to 4 digit number lock riddle: Can you crack the code?: Key pattern identification and analysisĪfter examining the five codes, the pattern that stands out, Another digit right but in wrong place.Ĭlue 5: Code 1 2 3 7 : Three digits are right but all are at wrong place. Another digit right but in wrong place.Ĭlue 4: Code 4 7 2 1 : One digit right and in the right place. Another digit right but in wrong place.Ĭlue 3: Code 3 6 9 4 : One digit right and in the right place. Go through the five clues on four digit codes of a number lock and find the code to unlock the number lock:Ĭlue 1: Code 8 9 5 1 : Two digits right but both are at wrong positions.Ĭlue 2: Code 2 1 6 9 : One digit right and in the right place. Analyze five clues each a 4 digit code with hints on right digit and right place in the code to find the 4 digit code that will open the number lock.

1 + 2 = 21 brain out