Abag contains 13 red bulbs,5 white bulbs and some green bulbs. a bulb is selected at random from the bag. the probability of selecting a red bulb is 1/3. 1) calculate the number of green bulbs in the bag2)all the green bulbs in the bag are removed. another 2 red bulbs and 3 white bulbs are added into the bag. if a bulb is picked at random from the bag, what is the probability that the bulb is red?