How many meaningful English words can be made with the letters TEBI using each letter only once in each word?

Four of the following five are alike in a certain way and so form a group. Which is the one that does not belong to that group ?

How many such pairs of letters are there in the word GUARDIAN each of which has as many letters between them in the word as in the English alphabet ?

What is the ratio of the total number of employees working in Patna to the total number of employees working in Delhi?

Fill in the blank space in order to make the sentence correct as per the given information.
The total number of employees working in ____ is more than the total number of employes working in Pune and Chennai together.

The total number of employees working in Kolkata forms approximately what percent of the total number of employees working in Mumbai?