4
$\begingroup$

Four administrators (A, B, C, and D) from a company have written letters about four topics: Energy, Security, Nutrition, and Manpower. Each letter has a unique topic, sender, and receiver.

Information:

  • the admin who has sent a letter about nutrition has received a letter about security from A.
  • the letter which has been sent by B has been received not by D.
  • the letter which has been received by D wasn't about nutrition.
  • none of the two admins have written letters to each other (for example, we don't have "B to A" if we have "A to B").

Question: If the letter about manpower has been sent by D, which admin has received the letter about energy?

$\endgroup$
5
$\begingroup$

This should be easy enough even without building a formal grid:

* D didn't receive the security letter (nutrition letter writer did, D wrote about manpower)
* D didn't receive the nutrition letter (says so in point 3)
* D didn't receive the manpower letter (he wrote it)

So as long as I've correctly understood the uniqueness rules,

D must have received the letter about energy.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.