2. Determine the smallest and largest five-digit odd natural number in which 3 digits are odd, and 2 are even.
2. A natural number is odd if its unit digit is 1, 3, 5, 7, or 9 1 POINT

For a number to be the smallest possible, its digits should be 1 and 0, and for it to be the largest possible, its digits should be 9 and 8.

1 POINT

The smallest five-digit odd natural number with 3 odd digits and 2 even digits is the number 10011.

2 POINTS

The largest five-digit odd natural number with 3 odd digits and 2 even digits is

the number 99889.

2 POINTS

TOTAL 6 POINTS

Note: Correct answers without justification earn 2 points each.