Step 1: Background of Gestalt psychology.
Gestalt theory (origin: Germany, early 20th century) is based on the idea that "the whole is greater than the sum of its parts." Humans perceive visual elements by grouping them into patterns, rather than seeing them individually.
Step 2: List of core Gestalt principles.
- Proximity (elements close to each other are grouped)
- Similarity (similar shapes/colors are seen as a group)
- Continuity (mind follows smooth paths)
- Closure (mind completes incomplete shapes)
- Figure-ground, symmetry, common region, etc.
Step 3: Analyze options.
- (A) Proximity and Similarity → Both are fundamental Gestalt principles. ✓
- (B) Continuity and Closure → Again, core Gestalt rules. ✓
- (C) Grain and Texture → Related to material/visual properties, not Gestalt. ✗
- (D) Scale and Proportion → Classical design principles, not Gestalt. ✗
Step 4: Conclusion.
Correct pairs of Gestalt principles = (A) and (B).
Final Answer: \[ \boxed{\text{(A) and (B)}} \]
Match the items in Group-I with the corresponding statements in Group-II.

P and Q play chess frequently against each other. Of these matches, P has won 80% of the matches, drawn 15% of the matches, and lost 5% of the matches.
If they play 3 more matches, what is the probability of P winning exactly 2 of these 3 matches?