Three of the following four number-pairs are alike in a certain way and one is different. Identify the different one.

Options

A. a) `15 : 115 `
B. b) `23 : 161`
C. c)` 29 : 203`
D. d) `27 : 189 `

Answer

A

Explanation

`23:161 "means" 7xx29=161.`
`29:203 "means"7xx29=203.` M
`27:189 "means"7xx27=189`.
but 15:115 is not in same pattern. So, option A is correct.