Four groups of numbers have been given, out of which three are alike in some manner and one is different. Select the group that is different.

632 : 325 : 236

426 : 642 : 246

In this 2,4, 6 are three  numbers use to form different combinations of given number

632 : 325 : 236

In this 6, 3, 2 and 5 are four numbers use to form different combinations of given numbers (odd)

289 : 829 : 928

In this 2,8, 6 are three  numbers use to form different combinations of given number

561 : 615 : 165

In this 1,5, 6 are three  numbers use to form different combinations of given number

option 2 is odd because 4 numbers are used in it , in others 3 numbers are used