Q15. A postman has to deliver 4 letters to 4 different houses. In how many ways can he deliver the letters so that every letter is delivered to the wrong house?Mathematics — NUST Mock By Dogers 5 — Question 15 of 200A. 6B. 5C. 9D. 12Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →