Number Classification

Study the given pattern carefully and select the number that can replace the question mark (?) in it.
 First row: 86, 72, 158
 Second row: 98, 111, 209
 Third row: 76, 65, ?
 (NOTE: Operations should be performed on the whole numbers, without breaking down the number into its constituent digits. For example, 13 – Operations on 13 such as adding/deleting/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.)

The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number pairs, EXCEPT one. Find that odd number pair.

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

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

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.