Lucky 13

lucky13

Contrary to popular belief, the number 13 is a lucky number.

Your task is to implement a method to see if together a and b are lucky. Your method should return true if either a or b or both are equal to 13 or the sum of a + b is 13.

lucky13( 13, 88 ) => true
lucky13( 0, 13 ) => true
lucky13( 10, 3 ) => true
lucky13( 9, 3 ) => false