Question

A seven digit telephone number is of the form ABC-DEFG. In one particular state, the digit ‘A’ is restricted to any number between 3 and 9. The digits B and C are restricted to any number between 1 and 8. The digits D,E,F, and G have no restriction. How many seven digit phone numbers are possible with these restrictions? Group of answer choices 5,760,000 10,000,000 4,480,000 7,200,000

Answer 1

Answer:

clearly

position A can have = 7 type of digits (3 to 9)

B and C can have 8 type of digits (1 to 8)

D,E,F,G can have 10 type of digits (0 to 9)

thus total possible combination can be

= 7*8*8*10*10*10*10

= 4480000