Which of these numbers is the odd one out? Options A) 4561 B) 3724 C) 9142 D) 6434

Question

Which of these numbers is the odd one out?

Options

A) 4561

B) 3724

C) 9142

D) 6434

Answer 1

3 of the numbers are even, so A is the odd number out.

There could be other reasons for choice, but this is certainly the most obvious!

Answer 2

To identify the "odd one out," you must put labels on each of the numbers. The one that is the only one that has or does not have the label is the "odd one out."

For example:

Integer -- 4561, 3724, 9142, 6434

Positive -- 4561, 3724, 9142, 6434

Composite (not prime) -- 4561, 3724, 9142, 6434

Odd -- 4561

Note that, with just four choices, there may be many labels that identify just one of the numbers as "odd one out." For example, "more even digits than odd digits" -- 6434