-|---| .-------.
| | | | |
| .---|---. | Hence proposed Conclusion is right.
|(I) | (O)|
.---------------.

pg144
_Solutions for Sec. 7, Nos. 1-6._ SL7-A

1.

No doctors are enthusiastic;
You are enthusiastic.
You are not a doctor.

Univ. "persons"; m = enthusiastic; x = doctors; y = you.

.---------------. .-------.
|(O) | | |(O)| |
| .---|---. | |---|---|
No x are m; | |(O)|(O)| | |(I)| |
All y are m. |---|---|---|---| .-------.
All y are x'. | |(I)| | |
| .---|---. | .'. All y are x'.
|(O) | |
.---------------.

Hence proposed Conclusion is right.

2.

All dictionaries are useful;
Useful books are valuable.
Dictionaries are valuable.

Univ. "books"; m = useful; x = dictionaries; y = valuable.

.---------------. .-------.
|(O) | (O)| |(I)|(O)|
| .---|---. | |---|---|
All x are m; | |(I)|(O)| | | | |
All m are y. |---|---|---|---| .-------.
All x are y. | | |(O)| |
| .---|---. | .'. All x are y.
| | |
.---------------.

Hence proposed Conclusion is right.

3.

No misers are unselfish;
None but misers save egg-shells.
No unselfish people save egg-shells.

Univ. "people"; m = misers; x = selfish; y = people who save egg-shells.

.---------------. .-------.
|(O) | | | | |
| .---|---. | |---|---|
No m are x'; | | | | | |(O)| |
No m' are y. |---|---|---|---| .-------.
No x' are y. | |(O)|(O)| |
| .---|---. | .'. No x' are y.
|(O) | |
.---------------.

Hence proposed Conclusion is right.
pg145
4.

Some epicures are ungenerous;
All my uncles are generous.
My uncles are not epicures.

Univ. "persons"; m = generous; x = epicures; y = my uncles.

.---------------. .-------.
|(O) | (I)| | |(