Bunuel wrote:
A set S contains the following elements: {7, 11, 15, 19, 23, x}. What is the value of x?
(1) The elements are in arithmetic progression.
(2) x is prime.
Value based Qs
St-1 If the elements are in AP then x can be 3 or 27. not unique value. insufficient.
St-2 X is prime, then X can be any prime no.- insufficient
Combine- X is prime and set is in AP the X must be 3 unique ans. Sufficient
Ans is C