Forgotten Bank Account Number
Today, John has to transfer 50 euro to the bank account of a Dutch
friend. He has written down the account number on a piece paper. But
since he had forgotten to take out the paper from his trousers when he
put them in the washing machine, one digit of the bank account number
became unreadable. The note says: 3170?4847.
The friend of John is climbing the Mount Everest at the moment, so it is impossible for John to call his friend. Suddenly he remembers that a for a valid Dutch bank account number it holds that the first digit times 9 + the second digit times 8 + the third digit times 7 + ...... + the ninth digit times 1 should be divisible by 11. John thinks for a moment and finds the correct number.
What is it?
That it is !
The friend of John is climbing the Mount Everest at the moment, so it is impossible for John to call his friend. Suddenly he remembers that a for a valid Dutch bank account number it holds that the first digit times 9 + the second digit times 8 + the third digit times 7 + ...... + the ninth digit times 1 should be divisible by 11. John thinks for a moment and finds the correct number.
What is it?
That it is !