Read the given instructions carefully and answer the related questions:

Six experts – P, Q, R, S, T, and U – delivered presentations on six different tech gadgets – Smartwatch, Tablet, Headphones, Laptop, Drone, and Camera – one after another, but not necessarily in the same order.

Three persons presented between Q, who brought a Smartwatch, and the person who brought a Drone. U presented immediately after the person who brought a Drone. The person who brought Headphones presented two places before the person who brought a Drone. T presented immediately before P. S presented after the person who brought a Tablet but before R. The person who brought a Laptop presented before the one who brought a Camera.

Who among the following delivered the presentation on the Laptop?

The correct answer is S.

Step-by-step Explanation:

Let us arrange the six experts (P, Q, R, S, T, and U) and their tech gadgets (Smartwatch, Tablet, Headphones, Laptop, Drone, and Camera) in positions 1 to 6 in order of presentation.

1. Determining positions for Q, Drone, and U:
- Q brought a Smartwatch.
- Three persons presented between Q and the person who brought a Drone.
- U presented immediately after the person who brought a Drone.
- If Q is at position 1, the Drone is at position 5, and U is at position 6.
(If Q were at position 2, the Drone would be at position 6, leaving no position for U. Hence, Q is at position 1.)

2. Determining position for Headphones:
- The person who brought Headphones presented two places before the person who brought a Drone (position 5).
- Therefore, Headphones is at position 3 (5 - 2 = 3).

3. Determining positions for T, P, S, and R:
- T presented immediately before P, which means T and P must occupy consecutive positions.
- The available position slots left for experts are 2, 3, 4, and 5.
- Position 3 is already assigned Headphones. To place T immediately before P, T must be at position 2 and P at position 3.
- S presented after the person who brought a Tablet, but before R. Thus, S must be at position 4 and R at position 5.
- Since S (position 4) presented after the Tablet, the Tablet must be at position 2 (presented by T).

4. Determining positions for Laptop and Camera:
- The remaining gadgets to assign are Laptop and Camera at positions 4 and 6.
- The person who brought a Laptop presented before the one who brought a Camera. Therefore, the Laptop is at position 4 (presented by S) and the Camera is at position 6 (presented by U).

Final Arrangement:
Position 1: Q – Smartwatch
Position 2: T – Tablet
Position 3: P – Headphones
Position 4: S – Laptop
Position 5: R – Drone
Position 6: U – Camera

Therefore, S delivered the presentation on the Laptop.