Answer:

At the beginning, there were total (3 + 5 + 2 + 6) = 16 marbles in the jar.

Marbles can be drawn from the jar in two technics: without replacement and with replacement.

If the marbles are drawn without replacement:

Probability of drawing a green marble first and then a yellow marble = {(5 / 16) * (6 / 15)} = (5 * 6 / 240) = (30 / 240) = (1 / 8) = 0.125