what they want is the position in the array not the value.

ex:

numbers = "2 4 5 6"

In this case the number 5 is the odd number and it is in the third(3) position.

hi the second test on the java version has a mistake, it should return true.
proof:

assertEquals("Should return false", false, TenMinWalk.isValid(new char[] {'w','e','w','e','w','e','w','e','w','e','w','e'}));