Suppose a jar contains four balls labeled 1, 2, 3, and 4. A second jar contains five balls,labeled 1, 2, 3, 4, and 5. An experiment consists of taking one ball from the first jar, and then taking a ball from the second jar?

There will be 4*5 = 20 outcomes.
{1, 1}, {1, 2}, {1, 3}, {1, 4}, {1, 5},
{2, 1}, {2, 2}, {2, 3}, {2, 4}, {2, 5},
{3, 1}, {3, 2}, {3, 3}, {3, 4}, {3, 5},
{4, 1}, {4, 2}, {4, 3}, {4, 4}, {4, 5}