What is the solution to this logical problem, please answer it to the master?

b Will be on duty.

Because all 5 points of opinion will be observed, so:

d Affirmative duty [(5) d requires to be on duty].

Explanation: Nothing to say, point 5 is true, so d must be on duty.

e must also be on duty [(4) If e is not on duty, then d is not on duty either] Explanation: There are two cases: E is on duty, then there is no violation of opinion 4, so there is no problem.

E is not on duty, which violates the 4th opinion: E is not on duty, but D is on duty, and the original conditions of E and D not being on duty at the same time are different from the original conditions, and cannot be established, so it is not chosen.

Opinion 1 is valid, so there are two options: A or C on duty.

Explanation: It was supposed to analyze two different situations, but it was not necessary.

For both article 2 and article 3 have the same result: B must be on duty. (Article 2: If the a-value.

class, then B is also on duty. Rule 3: If C is on duty, B is also on duty. Final Answer: b must be on duty.

The analysis can be seen in the figure below

Purely personal hand-made and opinion, without looking at any answer set.

If you have a question or a better explanation or a different answer, be willing to listen.

Hope that helps.

｛1｝e→a∨c p

2｝a→b p

3｝c→b p

4} Non-e non-d p

5｝d p45｝e t④⑤

6} Non-b p

26} Non-a t

36} Non-ct

236} Non-a Non-c t

1236} non-e t

123456}e non e t

12345}b Fallacies

1 All first questions: Ask them 3 "Are you a DA elf or a ja elf".

Suppose da is true, then the truth elf will say da, the fake elf will say da, the elf will say casually, if da is false, then ja is true, the true elf will say ja, the fake elf will say ja, and the elf will be arbitrary.

So 1) If 2 of the 3 elves say DA, then DA is true and JA is false, so you can judge whether DA is true or false, and at the same time the elves will come out, and then you only need to ask the two elves the second question: "How do you say "true" in your language? "You can make sure all three.

In the same way, 2 elves say ja, and one says da's determination method.

2) If all 3 are the same, press the next step.

Because the first question determines which DA and JA are true and which is false, so.

Suppose DA is true and JA is false.

The second question: Ask them what the 3 really say, the real elf must say da, the fake elf must say ja, and the elf will say whatever it is.

1) If two say DA and one says JA, then it is certain that the one who says JA is a false elf.

Then the third question asks the False Story: Pointing to one of the remaining two Elves, he asks him, "Is this the Truth Elf?" ”

2) If two say ja and one says da, then it is certain that the one who says da is the truth elf.

Then the third question is to ask the Truth Elf, pointing to one of the remaining two Elves and asking him, "Is this a False Elf?" Answering da means that it is a lie elf, and answering ja means that it is a elf.

The second problem is to let the turtle come out of its shell on its own.

The first question I thought about for 10 minutes and came up with it, and it was indeed a bit difficult, and the second question was not sure whether it was correct or not.

I just read other people's answers, and I think my answer is more reasonable, because at first you don't know which one is true or which one is false.

This question can be solved by elimination.

b, if his self-esteem is hurt, he must have accepted too many favors from others.

According to "When we receive too much favor from others, our self-esteem hurts" me, we know that it is not correct to push backwards, c, don't help him if you don't let him feel weak and incompetent.

According to the "if you help others too much, it will make them feel weak and incompetent" it is inconsistent with the negative proposition, so it is not true.

d, it is only when you help others too much that you make them feel weak and incompetent.

This proposition is incorrect based on the original statement that "if you help others too much, you will make them feel weak and incompetent".

If you sort out this paragraph, the main expression is the two meanings of option A, of course, "you don't help others too much" is the premise of all inferences, and "make him fall into the distress of inferiority" is its conclusion, and it is the latter condition.

When we receive too much favor from others, our self-esteem hurts.

This is the premise of the hypothesis of the title.

In addition to helping others, it will make them feel weak and incompetent, and other things may also cause this result. So neither BCD is right.

Helping others can cause them to feel inferior, but it is not the only one. Forward extrapolation is possible, but reverse extrapolation is not necessarily true.

B, C, and D are definitely incorrect, but there are certain problems with the expression of A. The first half of the sentence is fine, but the second half of the sentence is ambiguous, but if you don't consider the cause of "falling into the distress of inferiority", and only consider it from the perspective that if such a thing happens, it may have an unfavorable result, and A is correct.

For example, dads have long beards, but those with long beards are not necessarily dads.

[Problem Analysis] Correct answer A

In this question, we use the hypothetical counter-proof method, we notice that each person said three sentences, and only the first sentence said by C and D contained a negative, so try to start with the first sentence said by C and D.

There are only two cases for any one sentence, which is either true or false. In the first case, if C's first sentence "I have no brothers and sisters" is true, that is, C does not have any brothers and sisters, she cannot all tell the truth (because the person who always speaks the truth must have more than one brother and sister and more than one child), therefore, the three sentences C says can only be true and false, that is, the second sentence must be false, and the third sentence must be true.

The second case: Suppose that the first sentence C said is false, it means that she has brothers and sisters, since C has a false sentence in what she says and she has brothers and sisters, so what she says can only be true and false, then the second sentence is true, that is, she has sons, so C has more than one brother and sister and more than one child, so what she says should be true, so it contradicts "suppose C's first sentence is false", so the second case is impossible. From this, it can be concluded that what C said can only be the first case, that is, "true or false", and if the third sentence said by C is true, it can be seen that A must have a son.

Using the same method, it can be seen that the three sentences spoken by Ding are the same as C, and they can only be "true, false and true", from which it is concluded that "A is D's brother", that is, A has the sister of D, and A has a son. Therefore, A must always tell the truth. Therefore, a is the correct answer.