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

Choose the odd numeral pair/group in each of the following questions:

Directions: In the following question four words have been given, out of which three are alike in some manner and the for one is different. Choose out the odd one.
Triangle
Rectangle
Circle
Square 

Find the odd word in the following options.

Select the odd group of numbers. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g.13 – Operations on 13 such as adding /subtracting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

Three of the following four letter-clusters are alike in a certain way and one is different. Pick  the odd one out.

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

In the following question, select the odd word/letters from the given alternatives.