Four words have been given out of which three are alike in some manner, while one is different. Choose the odd one.

Select the option in which the words share the same relationship as that shared by the given pair of words.
Bank : River :: ? : Sea

Raju is 10th from the top and Ravi is 21st from the bottom. There are 3 students between them. How many total students are there in the class?

Identify the correct option to complete the following series.
1, 3, 5, 11, 21, 43, 85, 171,___

Identify the number that is different from the rest.

Identify the odd one form the following.

Identify the odd pair from the following.

Select the option that is analogous to the given pair.
CD : HI