Five students — Neel, Osha, Prem, Riya and Sahil — sit in a row of five chairs numbered 1 to 5 from the left. Prem sits in chair 4. Riya sits in the chair immediately to the right of Osha. Osha sits somewhere to the left of Neel. Neel sits at one of the two ends. Sahil does not sit in chair 1. Which student sits in chair 3?

Prem takes chair 4, so Osha and Riya, being next to each other in that order, can only be in chairs 1 and 2 or in chairs 2 and 3. Try chairs 2 and 3: then chairs 1 and 5 are left for Neel and Sahil, and since Osha must be to the left of Neel, Neel takes chair 5 and Sahil chair 1 — but Sahil is barred from chair 1, so this fails. So Osha is in chair 1 and Riya in chair 2, leaving chairs 3 and 5 for Neel and Sahil. Neel must be at an end, so Neel takes chair 5 and Sahil chair 3. The row reads Osha, Riya, Sahil, Prem, Neel. The traps: Osha is in chair 1, Riya in chair 2 and Neel in chair 5 — each is the answer to a different chair.