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Question

Consider the following information and answer the following questions based on it.

Five different boxes of blue, green, black, red and white are placed in an irregular order from left to right such that -

1. The black box is not on the end edges.

2. The white box is second from the right end.

3. There are two boxes between the red and black boxes and one box between the blue and red boxes.

Which box is in the middle of the row?

A. Black

B. Blue

C. Green

D. Red

The correct answer is

B

Solving the Box Arrangement Puzzle

This logic puzzle requires arranging five boxes of different colors based on a set of clues. We need to determine the position of each box from left to right to find the box in the middle of the row.

Understanding the Clues

Let's list the given clues about the arrangement of the blue, green, black, red, and white boxes:

  • Clue 1: The black box is not on the end edges (meaning it's not the first or last box).
  • Clue 2: The white box is second from the right end.
  • Clue 3: There are two boxes between the red and black boxes, and one box between the blue and red boxes.

Step-by-Step Deduction of Box Order

We have five positions for the boxes, let's number them from 1 (left end) to 5 (right end).

Position: 1 2 3 4 5

Let's use the clues to place the boxes:

Using Clue 2: The white box is second from the right end. The right end is position 5. The second position from the right is position 4.

Position: 1 2 3 4 5
Box: ? ? ? White ?

Using Clue 1: The black box is not at position 1 or position 5.

Using Clue 3 (part 1): There are two boxes between the red and black boxes. This implies a pattern like R \_ \_ B or B \_ \_ R. The possible pairs of positions for (Red, Black) with two positions in between are (1, 4), (2, 5), (4, 1), and (5, 2).

  • (1, 4): Red at 1, Black at 4. But White is at 4. Not possible.
  • (2, 5): Red at 2, Black at 5. But Black cannot be at position 5 (from Clue 1). Not possible.
  • (4, 1): Red at 4, Black at 1. But White is at 4 and Black cannot be at position 1. Not possible.
  • (5, 2): Red at 5, Black at 2. This fits with Clue 1 (Black not at 1 or 5). If Red is at 5 and Black is at 2, positions 3 and 4 are between them. This works.

Let's place Red at position 5 and Black at position 2 based on this deduction:

Position: 1 2 3 4 5
Box: ? Black ? White Red

Using Clue 3 (part 2): There is one box between the blue and red boxes. Red is at position 5. There must be one box between Blue and Red. This means Blue must be at position 3 (position 4 is between 3 and 5).

Position: 1 2 3 4 5
Box: ? Black Blue White Red

We have placed Black, Blue, White, and Red. The only remaining color is Green, and the only remaining position is position 1.

So, Green must be at position 1.

Position: 1 2 3 4 5
Box: Green Black Blue White Red

Verifying the Final Box Order

Let's check if this arrangement (Green, Black, Blue, White, Red) satisfies all the clues:

  • Clue 1: Black is at position 2, not an end. Correct.
  • Clue 2: White is at position 4, which is second from the right end (position 5). Correct.
  • Clue 3: Red is at 5, Black is at 2. Positions 3 and 4 are between them (Blue and White). There are two boxes. Correct. Blue is at 3, Red is at 5. Position 4 is between them (White). There is one box. Correct.

All clues are satisfied. The final order of boxes from left to right is Green, Black, Blue, White, Red.

Finding the Box in the Middle

In a row of five boxes, the middle position is position 3. Looking at our final arrangement, the box at position 3 is the Blue box.

Position: 1 2 3 4 5
Box: Green Black Blue White Red

Therefore, the box in the middle of the row is Blue.

Revision Table: Box Arrangement Details

Clue No. Description Deduction Resulting State
2 White is second from right. White is at Position 4. \_ \_ \_ White \_
1 & 3 (part 1) Black not at ends; 2 boxes between Red & Black. (R, B) pairs with 2 boxes between. Eliminate based on Clue 1 and White at 4. (Red, Black) = (5, 2). \_ Black \_ White Red
3 (part 2) 1 box between Blue & Red. Red is at 5, 1 box between implies Blue is at 3. \_ Black Blue White Red
Remaining Place remaining box/color. Green is the remaining color, Position 1 is remaining position. Green at 1. Green Black Blue White Red

Additional Information: Logic Puzzle Techniques

Logic puzzles like this one rely on careful reading and step-by-step deduction. Here are some common techniques:

  • Listing Information: Write down all given facts and constraints clearly.
  • Creating a Grid or Table: For problems involving matching categories (like people, pets, colors, etc.), a grid helps track possibilities and eliminate contradictions. For linear arrangements like this, drawing positions can be helpful.
  • Elimination: Rule out possibilities based on clues. For example, Black cannot be at the ends.
  • Combining Clues: Look for ways clues interact. Clue 3 about Red and Black had to be considered along with Clue 1 and the position of White from Clue 2.
  • Working from Certainty: Start with clues that give a definite position or relationship (like Clue 2 here).
  • Checking Your Work: Once you arrive at a solution, re-read all the original clues and ensure your final arrangement satisfies every single one.
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Important Questions from Box Puzzle

  1. Five boys A, B, C, D and E eat five different types of food F1, F2, F3, F4 and F5 (not necessarily in the same order). Each also likes a bird named B1, B2, B3, B4 and B5 (not necessarily in the same order). B eats F2. A does not like B3. E eats F1 but does not like B1 or B2. C does not eat F4 but likes B5. The one who eats F3 likes B3. B does not like B2. Which of the following statements are correct?

    I. A likes B2.

    II. C eats F5.

    III. E likes B4.

  2. Branches of five banks A,B,C,D and E are as follows:

    1. A, B and C are in Indore and Bhopal.

    2. A, B and E are in Indore and Gwalior

    3. B, C and D are in Raipur and Bhopal.

    4. A, E and D are in Gwalior and Jabalpur

    5. C,E and D are in Raipur and Jabalpur

    Branch of which bank is in all places except Gwalior?

  3. Which box is the first from the left?

    A. Red

    B. White

    C. Blue

    D. Green
  4. Which of the following statements is true?

    A. The black box is second from the left.

    B. The white box is second from the left.

    C. The green box is third from the left.

    D. The white box is third from the right.

  5. Read the following passage and answer the question.

    A, B, C, D and E are the five employees working in a company from Monday to Friday. Each one is working for only one day. D and E will not work on Thursday and Friday. C will work on the day immediately after E is working. D will work on the day immediately before the B’s working day.

    Who will work on Monday?

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