Seventh Digit
How many sides does a circle have?
Your fifth and sixth digits are "51". The riddle below is your seventh digit to open the vault
There are nine numbers, and this is your seventh number. How many sides does a circle have? none, 1, or 2?
VIII _ _ _ V _ _ _ 9
The vault do not have these digits
"0", "4" and "6"
Do you have all four digits in the correct order to open the vault?