a gardener has 10 identical-looking tulip bulbs, of which each will produce a different color tulip. Seven of the colors are unknown, however, one will become white, one will become yellow, and one will become pink. She plants them arbitrarily in a row. When the flowers start to bloom, what is the probability that the yellow one is the first in the row, the white one is second, and the pink one is at the end of the row?