Question

(1) All balls are locks.
(2) Some locks are keys

• A. All locks are keys
• B. Some balls are locks
• C. Some balls are keys
• D. Some balls may be keys

Answer 1

Answer: (D)

Some balls may be keys

In this example, the statements are not numbered but one follows the other in the form of a sentence but that does not change the meaning of the question or the statements.
So, now we draw the statements as we have been drawing in the above examples, but this time, a combined diagram directly.
But, there are 2 cases to the given set of statements.
Since, there are 2 cases, case I shows that no balls are keys while case II shows that some balls are keys. Therefore, the conclusion is some balls mayor may not be keys. Thus option (4) some balls may be keys in the correct conclusion of all given options.