In each of the given number-clusters, the number on the right side of '=' is calculated by performing certain mathematical operations on the two numbers on the left of '='. All three number-clusters follow the same pattern. Select the number that can replace the question mark (?) in the third number-cluster. 5, 3 = 98 7, 4 = 279 9, 5 = ?

108 is related to 12 following a certain logic. Following the same logic, 234 is related to 26. To which of the following is 198 related, following the same logic? (NOTE: Operations should be performed on whole numbers.)

Select the option that follows the same set of mathematical operations as given in the reference sets below. (NOTE: Operations must be performed on whole numbers without breaking down digits.) Set 1: 8 - 64 - 84 - 252 Set 2: 12 - 144 - 164 - 492