Tough and Tricky questions: Statistics.
Set X consists of prime numbers {3, 11, 7, K, 17, 19}. If integer Q represents the product of all elements in set X and if 11Q is an even number, what is the range of set X?	Choose the correct choice from the following answers:
A) 14	B) 16	C) 17	D) 20	E) 26
Since 11Q = Even therefore Q has to beEVENsince 11 is a odd integer (Even * Odd = Even)   Similarly, Q is the product of all integers in set X But all integers in Set X are odd except the unknown K and since X contains only prime numbers, K has to equal to 2... ( 2 is the only even prime number and the product of all prime numbers in set X has to be Even, Even * Odd = Even)   Since you know value of K you can calculate the range = Largest integer in the set minus Smallest integer in the set = 19-2= 
<gadget id="calculator">19-2</gadget>
<output>17</output>
17   Answer is 17
<result>C</result>
Tough and Tricky questions: Statistics.
Set X consists of prime numbers {3, 11, 7, K, 17, 19}. If integer Q represents the product of all elements in set X and if 11Q is an even number, what is the range of set X?