+9 Given the set {1,2,3,5,8,13,21,34}, which integers between 30 and 50 cannot be written as a number from the set on its own, or as the sum of either two or three numbers from the given set
+128460 31 = 21 + 8 + 2 41 = 34 + 5 + 2
32 = 21 + 8 + 3 42 = 34 + 8
33 = cannot be written 43 = 34 + 8 + 1
34 = 34 44 = 34 + 8 + 2
35 = 34 + 1 45 = 34 + 8 + 3
36 = 34 + 2 46 = cannot be written
37 = 34 + 3 47 = 34 + 13
38 = 34 + 3 + 1 48 = 34 + 13 + 1
39 = 34 + 5 49 = 34 + 13 + 2
40 = 34 + 5 + 1
