Generate Random Number from fix Set of numbers in iphone

Question

Suppose I have One set of numbers i.e {1, 6, 3, 5, 7, 9} I want to Generate Random number from this set of number only i.e. a Generated number should be random and should be from these number({1, 6, 3, 5, 7, 9}) only.

standard C/C++ function will also do...

Answer 1

arc4random%(set count) = a random index.