|
|
|
|
Answer
6666. Eliot could only figure out the code from the information that Drew says is sufficient if all the digits in that number are the same; otherwise, he could not know in what order the digits occur. Furthermore, since he cannot determine the number from her first statement about it, the product cannot be unique and so the number cannot be 1111, 5555, 7777, 8888, or 9999. Of the remaining possibilities only 6666 meets the requirement that the first digit of the square of the product of its digits should be odd: 6x6x6x6 = 1296, squared = 1679616.
|
Send mail to
Lloyd with questions or comments about
Aha! Puzzles
|