Unfortunately, he is having trouble committing this security number to memory. So far, he has memorized a number consisting a selection of different digits from the security number.
He made a note of this memorized number on the memo sheet on which he was given the security number, but he absent-mindedly left the paper lying around the house.
When his wife found the paper containing the two numbers, she multiplied them together and found the product was a seven-digit number in which all the digits were the same.
What is George’s security number?
re: .
