HELP ASAP PLEASE How many phone numbers are, possible in the area code (407), if the number has the form ABC- where A is restricted to 3-9, and B is restricted to 1-9 C is restricted 2-6 and X can be any number from 0-9,
a. 3,150,000
b) 3,600,000
c) 3,001,500
d) 2,520,000