Question

How many sisters does Sunny have?
(I) Sunny is the only son of his parents.
(II) Sunny’s parents have three children.

• A. Only statement I alone is sufficient
• B. Only statement II alone is sufficient
• C. Statements I and II together are sufficient
• D. Either statement I or II alone is sufficient

Answer 1

The Correct Option is C

To determine how many sisters Sunny has, we analyze the given statements individually and then together.   Statement I: Sunny is the only son of his parents. This statement alone implies that Sunny has no brothers, but it gives no information about the number of sisters. Thus, statement I alone is not sufficient. Statement II: Sunny’s parents have three children. This statement provides the total number of children but does not specify their genders or how many of them are sisters. Thus, statement II alone is not sufficient. Combining Statements I and II: From statement I, we know there are no brothers, and from statement II, we know there are three children in total. If Sunny is the only son, then the other two children must be sisters. Therefore, combining both statements, we find that Sunny has two sisters. Conclusion: Statements I and II together are sufficient.

Answer 2

To determine how many sisters Sunny has, statements I and II together are sufficient to answer the question.

Additional Context:

• Statement I: "Sunny is the only son of his parents."
  • Implies Sunny has no brothers (only son)
  • Does not specify the number of sisters (could be 0 or more)
  • Insufficient alone as it doesn't give sister count
• Statement II: "Sunny’s parents have three children."
  • Indicates total siblings = 3 (including Sunny)
  • Does not specify gender distribution
  • Insufficient alone as sisters could be 0, 1, or 2
• Combined analysis:
  • From I: Only son ⇒ no brothers
  • From II: Total children = 3
  • Thus, Sunny + 2 sisters (since he's the only son)
  • Conclusion: Sunny has 2 sisters
• Key points:
  • Neither statement alone provides complete information
  • Together they uniquely determine sister count
  • This is a classic example of logical sufficiency in reasoning questions

Correct Answer: (3) Statements I and II together are sufficient to answer the question.