For the case where there are 4 cent stamps and 7 cent stamps, construct a table of values of 4m + 7n, m = 0, 1, 2, . . .; n = 0, 1, 2, . . .
Examine the table for entries (whole numbers) that CANNOT be formed 4m + 7n. The whole numbers 1, 2, 3, 5, 6, 9, 10, 13, 17 are not in the table. Why? Why are all whole number greater than 17 in the table? Are there patterns? Here is one ---
