There are 4 green counters 6 yellow counters and 2 red counters. What is the theoretical probability of picking a yellow counter in number form?

The total number of counters is 4 green + 6 yellow + 2 red = 12 counters.

The theoretical probability of picking a yellow counter is the number of yellow counters divided by the total number of counters:

6 yellow counters / 12 total counters = 1/2

So the theoretical probability of picking a yellow counter in number form is 1/2 or 0.5.