If, in a series. there are m items whose ranks are common, then which factor is added for correction for each repeating value in both the series?

If, in a series. there are m items whose ranks are common, then which factor is added for correction for each repeating value in both the series? Correct Answer <span class="math-tex">\(\dfrac{1}{12}m(m-1)(m+1)\)</span>

Related Questions

Question : What is Sachin's rank from the top in a class of 25 students ?

Statements :
I. Sachin ranks three ranks above Amit who ranks 18th from the bottom.
II. Sachin's rank from the top is two ranks below Deepti who ranks 23rd from the bottom.
Gaurav ranks eighteenth in a class. What is his rank from the last ? I. There are 47 students in the class. II. Jatin who ranks 10th in the same class, ranks 38th from the last.
Question : Gaurav ranks eighteenth from the top in a class. What is his rank from the last?

Statements :
I. There are 47 students in the class.
II. Jatin who ranks 10th in the same class, ranks 38th from the last.
There are some chairs and some tables in a shop. Some are wooden while other are steel made. If two items are picked up at random without replacement then find the probability that both are wooden. Statement I: There are total 42 chairs and 30 tables in the shop. Statement II: 24 items are not wooden in the shop which is 1/3rd of the total items in the shop.