I have to correct the octal numbers: 0766 and 6545

I am given the information of the parity bits

- Parity bit 1 = odd

- Parity bit 2 = odd

- Parity bit 4 = even

- Parity bit 8 = even

However whenever I try to solve this I screw up somewhere in my working.

If someone could answer these two for me and use one of them as an example of how to work it out It would be very much appreciated. My Holiday's finish on the 22th and I need to be able to understand how this works before then.