Which of the following random variables is geometric? The number of digits in a randomly selected row until a 7 is found. The number of 7s in a row of 50 random digits. The number of tails when a coin is tossed 50 times. The number of diamond cards obtained in a seven-card deal-out of a shuffled deck of 52 cards. The number of 2s when rolling a die 5 times.