Question

The set S contains some real numbers, according to the following three rules.
(i) 1
1 is in S.
(ii) If a
b is in S, where a
b is written in lowest terms (that is, a and b have highest
common factor 1), then b
2a is in S.
(iii) If a
b and c
d are in S, where they are written in lowest terms, then a+c
b+d is in S.
These rules are exhaustive: if these rules do not imply that a number is in S, then that
number is not in S. Can you describe which numbers are in S?

Answer 1

Answer:

1 is the correct answer

Step-by-step explanation:

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