Salesclerks at a store are giving away candles. There are 12 candles on a tray. Three are white and two are red. The rest are green or blue. When choosing a candle at random from the tray, a customer is as likely as not to select a green candle. What tis the likelihood that the customer will select a blue candle? Tell whether it is impossible, unlikely, equally likely as not or certain. Explain your answer.