CAT 1999 — DILR Question 13
Directions: Each question has a main statement followed by four statements labelled A, B, C and D. Choose the ordered pair of statements where the first statement implies the second, and the two statements are logically consistent with the main statement.
Whenever Rajeev uses the Internet, he dreams about spiders.
A. Rajeev did not dream about spiders.
B. Rajeev used the Internet.
C. Rajeev dreamt about spiders.
D. Rajeev did not use the Internet.
Answer & solution
AD
- B
DC
- C
CB
- D
DA
The question statement clearly states that whenever Rajeev uses the Internet, he dreams about spiders.
However, this does not mean that he dreams about spiders only when he uses the Internet. Therefore,
using the Internet is only one possible condition for Rajeev to dream about spiders. Thus, the Venn diagram
for the question will be:
Where,
UI → Uses Internet
DS → Dreams of spiders
Answer choice (a) AD states that Rajeev did not dream about spiders, and hence he did not use the Internet.
This logically follows the above Venn diagram. If the main set does not occur, the subset will also not occur.
Thus, AD is the right option.