A function has to have unique x values.
Look at
(1) 2 and 4 repeat repeat
(2) 0 repeats
(3) all unique
(4) 0 repeats
That’s it — 2 more points!
A function has to have unique x values.
Look at
(1) 2 and 4 repeat repeat
(2) 0 repeats
(3) all unique
(4) 0 repeats
That’s it — 2 more points!