A dice is thrown two times means two dice are thrown one time.

Now the possible outcomes are:

(1,1), (1,2), (1,3), (1,4), (1,5), (1,6)              {(x,y): x comes from 1st dice and y comes from 2nd dice }

(2,1), (2,2), (2,3), (2,4), (2,5), (2,6)

(3,1), (3,2), (3,3), (3,4), (3,5), (3,6)

(4,1), (4,2), (4,3), (4,4), (4,5), (4,6)

(5,1), (5,2), (5,3), (5,4), (5,5), (5,6)

(6,1), (6,2), (6,3), (6,4), (6,5), (6,6)

Now there are total 36 outcomes.