Assertion (A): (1³ + 2³ + 3³)¹/² = x, then x = √1 + √8 + √27. Reason (R): x = (1 + 8 + 27) 1. A is true, but R is false. 2. A is false, but R is true. 3. Both A and R are true, and R is the correct reason for A. 4. Both A and R are true, and R is the incorrect reason for A.