Explanation:

- A and B are partners with profit sharing in the ratio of 11:4.

- C is admitted as a new partner.

- A surrenders 1/11^th of his share to C.

- B surrenders 1/4 of his share to C.

- To find the sacrificing ratio, calculate the part of the share surrendered by A and B.

- A's original share = 11/15, B's original share = 4/15.

- A surrenders 1/11 of 11/15, which equals 1/15.

- B surrenders 1/4 of 4/15, which equals 1/15.

- The ratio of shares sacrificed by A and B each is 1/15. Thus, their sacrificing ratio is 1:1.

2. 1 : 1

.