Step-by-step explanation: there are 36 possibilities when you have two dice. each dice have one two on them. therefore you have a 2 out of 36 chance of rolling a 2.
For each of the possible outcomes add the numbers on the two dice and count how many times this sum is 7. If you do so you will find that the sum is 7 for 6 of the possible outcomes. Thus the sum is a 7 in 6 of the 36 outcomes and hence the probability of rolling a 7 is 6/36 = 1/6.
