Q. 38 Consider a set U of 23 different compounds in a Chemistry lab. There is a subset S of U of 9 compounds, each of which reacts with exactly 3 compounds of U. Consider the following statements:
I. Each compound in U \ S reacts with an odd number of compounds. II. At least one compound in U \ S reacts with an odd number of compounds. III. Each compound in U \ S reacts with an even number of compounds.
Which one of the above statements is ALWAYS TRUE?
(A) Only I
(B) Only II
(C) Only III
(D) None
Answer: (B)
Explanation:
