Hi guys here is the question . An area code is the first 3 digits in a phone number and indicates the location of either the province or the city. In Canada, the following area codes exist:
Québec (Québec City) 418
Québec 450, 819
British Columbia 250, 604, 778
Alberta (south) 403
Ontario 519, 613, 705, 807
Yukon and NW Territories 867
Toronto (Ontario) 289, 647
Ontario (Toronto Metro) 416
New Brunswick 506
Nova Scotia 902
Notice that there are 3 area codes for British Columbia: 250, 604 and 778. It will be necessary to
add another area code as the population increases. The new area code cannot be the same as an
existing code, it must begin with a 3 and end in an even number. Determine the number of
possible area codes to choose from.
What i attempted was to use the fundamental counting principle and see there is 3 spots first spot is taken so 3 _ _ second spot can be any one from 0-9 and the third one has to be even and cant be the same as any other area code meaning 4 possible choices 10*4 = 40 but the answer says 49 what did i do wrong?