Explanation:

- The sequence is divided into two series: odd numbers and their products with preceding and succeeding numbers.

- First sequence (odd numbers): 1, 3, 5, 7, 11

- Second sequence (product of preceding and succeeding in the first sequence): 3*5, 5*7, 7*11 = 15, 35, 77

- Applying the operations, the pattern forms: 1, 3, 5, 7, 11, 15, 35, X, 126

- Compare 35 (product of 5 and 7), so X should be the product of 7 and 11.

- Calculating 7 * 11 gives us 77.

- Option 1: 41 (Incorrect)

- Option 2: 35 (Incorrect)

- Option 3: 49 (Incorrect)

- Option 4: 53