In the following question, four number pairs are given. The number on the left side of (–) is related to the number of the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of the same Logic/Rule/Relation. Select the odd one out from the given alternatives.

This question was previously asked in

DSSSB PGT Computer Science Female General Section - 11 July 2021 Shift 1

Option 1 : 79 - 172

According to the question, The number on the left side of (–) is related to the number on the right side of (–) with some Logic/Rule/Relation.

__LOGIC__: Digit Sum of First Number × 11 = Second Number

Now we will check each option and find the odd one out.

**(1) 79 - 172**

If we add left side numbers digits as 7 + 9 = 16 and take the square of this number as 16 × 11 = 176 ≠ 172

which is not equal to the right side number 112.

**(2) 83 - 121**

If we add left side numbers digits as 8 + 3 = 11 and take the square of this number as 11 × 11 = 121

which is equal to the right side number 121.

**(3) 47 - 121**

If we add left side numbers digits as 4 + 7 = 11 and take the square of this number as 11 × 11 = 121

which is equal to the right side number 121.

**(4) 53 - 88**

If we add left side numbers digits as 5 + 3 = 8 and take the square of this number as 11 × 8 = 88

which is equal to the right side number 121.

Hence, **option (1)** is the correct answer.