Permutations and Combination. I don't understand the question.

Question

The four faces of a regular tetrahedron are painted with the colours red, yellow, blue and green respectively. When the tetrahedron is tossed, the colour of its face resting on the floor is regarded as the result of the toss. If the tetrahedron three times, find the number of different results that can be obtained.

Answer 1

r on the first toss

rr, ry, rb, rg on the second toss

y on the first toss

yr, yy, yb, yg on the second toss

b on the first toss

br, by, bb, bg on the second toss

g on the first toss

gr, gy, gb, gg on the second toss

4^2=16 combinations of 2 tosses

each of these 16 combos can be with r, y, g, or b for a total of 16*4=64 different results

4^3=64