Question

DETERMINE THE NUMBER OF POSSIBLE OUTCOMES USING FCP(FUNDAMENTAL COUNTING PRINCIPLE).
1. How many four-digit numbers can be formed from the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 if
a. Repetition is not allowed
-
b. Repetition is allowed
-

Answer 1

I Think The Answer Is 81

Answer 2

Answer:

the answer of this question is 81