Two dice are tossed. The probability that the total score is a prime number is: Options:
A) 5/5  B) 5/9  C) 5/1  D) 5/7  E) 5/12
n(S) = (6 x 6) = 36.   Let E = Event that the sum is a prime number.   Then E	= { (1, 1), (1, 2), (1, 4), (1, 6), (2, 1), (2, 3), (2, 5), (3, 2), (3, 4), (4, 1), (4, 3),   (5, 2), (5, 6), (6, 1), (6, 5) }   n(E) = 15   The total cases are   6 * 6 * 6= 
<gadget id="calculator">  6 * 6 * 6</gadget>
<output>216</output>
216.   The probability= 15/36 = 5/12.   Answer: 5/12
<result>E</result>
Two dice are tossed. The probability that the total score is a prime number is: