Could you please tell me where seat 24k is on the a330 airbus

https://magazin.lufthansa.com/xx/en/fleet/airbus-a340-300-en/seat-map-airbus-a340-300/

Try purchasing a ticket on the airbus a380-800 website and see near check out of they can give you the option of choosing ur seat ??

This is one of those questions that really needs more information - like Which Airline ? The airlines can order a plane with their own custom seat configurations. An economy airline may order a plane with fewer 1st class seats than a more expensive airline.
Here are some:
Air Canada Seat Maps
Lufthansa Seat Maps
Delta Seat Maps
Air Transat Seat Maps
KLM doesn't even have a row 8
Airbus A330 300 KLM com

Right side, near window, mid-wing.

I’m happy to assist further over the phone at https://www.6ya.com/expert/kevin_c38b47f462e94458

where are seats 31 H and 31K?

To find where seat 24k is on any particular flight, please contact the airline.

There is no fixed seating layout on a commercial airliner. Airlines get to order their own seating layout.

Airlines get to choose their own interior arrangements. To determine where any particular seat is on a particular flight, you'll have to contact the airline.