This is an out-of-context sample from something like iqtest.dk, which builds up from easy examples to harder once over 30 min or so. If you go through the complete test, by the time you hit this example you are well ready for XOR-type patterns, so it would likely take you only seconds.
This is an out-of-context sample from something like iqtest.dk, which builds up from easy examples to harder once over 30 min or so. If you go through the complete test, by the time you hit this example you are well ready for XOR-type patterns, so it would likely take you only seconds.