Find odd one out from the following. Square, Rectangle, Parallelogram, Triangle

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the letter cluster that is different.

Select the set of numbers that is similar to the following set.

(12, 187, 15)

Find the odd numeral pair in each of the following questions.

Find the odd one out.

Find the odd one out of the choices given therein.

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

Find the odd one out from the following options. 

Odd one out: