Question

Write the set D of all positive odd numbers less than 10 in roster notation.

a) D={1,3,5,7,9}
b) D={2,4,6,8}
c) D={1,2,3,4,5,6,7,8,9}
d) D={1,2,3,4,5,6,7,8,9,10}

Answer 1

The student is seeking to identify the set of all positive odd numbers less than 10 which, when listed in roster notation, is D={1,3,5,7,9}. This corresponds to option a).

Step-by-step explanation:

The student is asking to write the set D of all positive odd numbers less than 10 in roster notation. The roster notation is a way of displaying the elements of a set by listing each member of the set without repetition and within braces ({}). Considering the definition, the only set among the options provided that consists of positive odd numbers less than 10 is D={1,3,5,7,9}. Thus the correct answer to the student's question is option a).