The formula for Calculating Sacrificing Ratio of a partner is:

Old Ratio - New Ratio

The correct answer is Option (1) - Old Ratio - New Ratio

Sacrificing ratio is calculated at the time of admission of a new partner because old partners sacrifice some of their share in profit in favor of new partner. It is the ratio in which any partner sacrifice their share of profit in favour of new partner. It is calculated by subtracting new share from old share.