A Die Is Cast Repeatedly Until a 4 Falls Uppermost

Multiple Choice

A die is cast repeatedly until a 4 falls uppermost. Let the random variable X denote the number of times the die is cast. What are the values that X may assume? ​

A) X may assume the values in the set S = {1, 2, 3, ...}
B) X may assume the values in the set S = {4}
C) X may assume the values in the set S = {1, 2, 3, 4, 5, 6}