Final answer:
The set of natural numbers less than 'n' can be expressed in roster form as {0, 1, 2, 3, ..., n-1} or {1, 2, 3, 4, ..., n}.
Step-by-step explanation:
The set of natural numbers less than n can be expressed in roster form as:
a) {0, 1, 2, 3, ..., n-1}
b) {1, 2, 3, 4, ..., n}
c) {0, 1, 2, 3, 4, ..., n-1}
d) {1, 2, 3, ..., n}
For example, if n is 10, then the set of natural numbers less than 10 in roster form would be:
a) {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
b) {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
c) {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
d) {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}