What does C stand for in BCSBI ?

Three of the following four number-clusters are alike in a certain way and thus form a group. Which is the one that does not belong to that group?

In the following question, select the odd words from the given alternatives.

Four number-pairs are given, out of which three are alike in a certain manner and one is different. Choose the different number-pair.

In the following question, select the odd pair of numbers from the given alternatives.

Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different.

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

Odd one out

Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different.

Four letter clusters are given, three of them are alike in a certain manner and one is different. Choose the different letter cluster.