Question

From the digits 9, 8, 7, 5, 3, and 1, find the number of positive integers, each consisting of three digits

Answer 1

216 and 120 since you didn't give the questions.

Answer 2

if we can repeat
6 numbers
6*6*6=216 ways

therea re 216 different 3 digit numbers you can make if we can repeat

if we cannot repeat
6*5*4=120, 120 ways if we cannot repeat numbers