Question 1173628
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<pre>

There are 5 cases, when exactly 4 of 5 items answered correctly.


Add to it one case when all 5 items answered correctly, and you will get the <U>ANSWER</U>  5 + 1 = 6, finally.
</pre>

Solved.



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<H3>The post-solution note:</H3>


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;@ewatrrr produced different answer from mine, &nbsp;and it  &nbsp;<U>REQUIRES &nbsp;me</U>  &nbsp;to make explanations.


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The cause is in that &nbsp;@ewatrrr &nbsp;INCORRECTLY &nbsp;treats the notion &nbsp;"answer".




&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In this context, &nbsp;the <U>answer</U> &nbsp;IS &nbsp;NOT &nbsp;HOW &nbsp;or &nbsp;WHAT &nbsp;the teacher evaluates the student's &nbsp;answer.

    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;It is not a  &nbsp;"CORRECT" &nbsp;or &nbsp;"INCORRECT" &nbsp;output value of the item.


    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For each &nbsp;"item", &nbsp;the &nbsp;<U>answer</U> &nbsp;is one of options &nbsp;A, &nbsp;B, &nbsp;C, &nbsp;or &nbsp;D, &nbsp;marked by student and treated as the answer.


    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;It is absolutely standard and traditional interpretation in this kind of problems.




&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Keeping it in mind, &nbsp;EVERYBODY &nbsp;should &nbsp;CLEARLY &nbsp;UNDERSTAND &nbsp;that my solution is CORRECT,

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;while @ewatrrr solution is &nbsp;WRONG.



They are &nbsp;VERY &nbsp;ELEMENTARY &nbsp;conceptions for this kind of problems, &nbsp;that everybody knows or should know --- but not &nbsp;@ewatrrr.