Explanation:

- To find the LCM of the numbers 63, 91, and 133, we start by breaking them into prime factors:

- 63 = 3^2 * 7

- 91 = 7 * 13

- 133 = 7 * 19

- The LCM takes the highest power of all the prime factors present:

- From 63: 3^2

- From both 91 and 133: 7 (7 is common and appears in both)

- From 91: 13

- From 133: 19

- Thus, the LCM = 3^2 * 7 * 13 * 19 = 15561

- Option:4, 15561 is the correct answer.