Led combination light up

Hi,

I'm new in Arduino.

I have 12 led and and I have placed them like a keyboard matrix 4X4.

1 2 3 4 5 6 7 8 9

0 *

I have 3 buttons that represents 4, 6 and 8.

I would like to turn the led on in all combinations of 4,6 and 8 digit code.

What should I do?

Best regards Samer

You should explained more clearly what you want to do. What LEDs do you want to turn on under what conditions? How have you wired up the LEDs and how have you wired up the switches? A diagram would be good.