Find the odd one out from the given alternatives.
81:243, 16:64, 64:192, 25:75

Options

A. ` 81: 243`
B. `16: 64`
C. `64 : 192`
D. `25 : 75`

Answer

B

Explanation

The second number is three times the first number except in the case of option (2).
`81 xx 3 = 243`
`64 xx 3 = 192`
`25 xx 3 = 75`
But, `16 xx 4 = 64`