There are exactly six groups in this year's Independence Day parade: Army, Navy, Air Force, Coast Guard, Special Forces, and Police force. Each group marches as a unit; the groups are ordered from first, at the front of the parade, to sixth, at the back. The following conditions apply:
- At least two groups march behind the Special Forces but ahead of the Coast Guard.
- Exactly one group marches behind the Army but ahead of the Police force.
- The Navy is the first, third, or fifth group.
Question 1) Which one of the following could be an accurate list of the groups in the Independence Day Parade in order from first to last?
A. Army, Special Forces, Police force, Coast Guard, Navy, Air Force
B. Navy, Special Forces, Air Force, Coast Guard, Army, Police force
C. Police force, Special Forces, Army, Navy, Air Force, Coast Guard
D. Air Force, Special Forces, Navy, Army, Coast Guard, Police force
E. Coast Guard, Police force, Air Force, Army, Navy, Special Forces
Answer - (D)
Explanation - List the possible order type
The first is to understand the constraints given in the question and apply them to the list. Then go with the process of elimination. Look for answers that deviate from the rules.
Answer choice (A): This answer is eliminated by the first rule. In this instance, there is only one group separating the Special Forces and Coast Guard.
Answer choice (B): This answer choice is eliminated by the third rule. In this answer, there is no group between Army and Police force
Answer choice (C): This answer is eliminated by the third rule because the Navy marches fourth.
Answer choice (D): This is the correct answer.
Answer choice (E): This answer violates both the first and second rules.
Question 2) If the Navy marched immediately ahead of the Police force, then which one of the following could be the fourth group?
B. Air Force
C. Coast Guard
D. Special Forces
E. Police force
Answer - (E)
Explanation – conditional reasoning type
This problem can be solved by constructing a template and fixing the confirmed places and possible places for the different groups
Answer choice (A): Under the condition in this question, the Navy must march third.
Answer choice (B): Under the condition in this question, Air Force must march fifth or sixth.
Answer choice (C): Under the condition in this question, Coast Guard must march fifth or sixth.
Answer choice (D): Under the condition in this question, Special Forces must march first.
Answer choice (E): This is the correct answer choice.