Question

How many different sequences of 4 digits are possible if the first digit must be 3, 4, or 5 and if the sequence may not end in 000? Repetition of digits is allowed.
A. 1,512

B. 2,999

C. 2,997

D. 2,000

Answer 1

my guess is \(3\times 10\times 10\times 10-1\)

Answer 2

3,000 - 3=2997