Solutions
Important Point
Concept:
1) We have to check the conclusions are 100% match with the statement. If the conclusion is 100% match with the given statement then the conclusion is true. If there is a 1% chance of not following the statement then the conclusion is considered to be false.
2) The possibility case can be considered to be "false" in "definite case".
3) In Possibility case, either "can" or "possible" word must be present.
The least possible Venn diagram for the given statements is as follows,

Conclusion:
I. Some dry are pitch → False (No direct relation given hence, false)
II. Some pitch are not green → True (No green is pitch so some pitch are not green is true)
III. No pitch is dry → False (No direct relation given hence, false)
Conclusive I and III form complementary pair.
Thus, Either conclusion I or III and II follow.
Note:
Conditions of Either-or case:
1. The elements should be the same in both the statements.
2. Individually both the conclusions should be false.
3. One conclusion should be positive and one conclusion should be negative (Complementary pair)
The two complementary pairs are:
1) All + Some not
2) No + Some
Additional Information
