Tough and Tricky questions: Statistics.
Set X consists of prime numbers {3, 11, 7, K, 17, 19}. If integer W represents the product of all elements in set X and if 11W is an even number, what is the range of set X?	Choose the correct choice from the following.
A) 14 B) 16 C) 17 D) 20 E) 26
Since 11W = Even therefore W has to beEVENsince 11 is a odd integer (Even * Odd = Even)   Similarly, W 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 W represents the product of all elements in set X and if 11W is an even number, what is the range of set X?