On the left die, the numbers 1,4 & 5 cannot
be seen. On the right die it's 2,3 & 6.

These numbers add up to 21

The highest total that could be rolled in a single roll is 12.
12 x 100 = 1,200


For each possible roll of the first die, there are six possibilities for the second die.

So there are 36 possible combinations