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Question

Study the given pattern carefully and select the number that can replace the question mark (?) in it.

\(\begin{array}{} {25}&{40}&{10}\\ {81}&9&9\\ ?&{16}&8 \end{array}\)

This question was previously asked in
SSC Stenographer 2019 Previous Year Paper (24-Dec-2020) (Shift 2)
The correct answer is

32

Solving the Number Pattern Matrix Puzzle

The question asks us to identify the pattern in the given matrix of numbers and use it to find the missing number represented by the question mark (?). Let's look at the numbers in each row:

Row Column 1 (A) Column 2 (B) Column 3 (C)
1 25 40 10
2 81 9 9
3 ? 16 8

We need to find a consistent relationship between the numbers in the columns (A, B, and C) that applies to all rows.

Identifying the Matrix Logic and Relationship

Let's examine the relationship between the second number (B) and the third number (C) and how they might relate to the first number (A) in each row.

  • Row 1: Numbers are 25, 40, 10. Here, A=25, B=40, C=10.
  • Row 2: Numbers are 81, 9, 9. Here, A=81, B=9, C=9.
  • Row 3: Numbers are ?, 16, 8. Here, A=?, B=16, C=8.

Let's try to find a mathematical operation involving B and C that results in A.

Testing Potential Patterns

Consider the relationship between B, C, and A:

  1. Pattern Attempt 1: Is A related to the sum or product of B and C?
    • Row 1: \(B+C = 40+10 = 50\). \(A=25\). \(50/2 = 25\). So, \(A = (B+C)/2\). Let's check Row 2.
    • Row 2: \(B+C = 9+9 = 18\). \(A=81\). \(18/2 = 9\). \(9 \neq 81\). This pattern does not apply to all rows.
  2. Pattern Attempt 2: Is A related to the product of B and C?
    • Row 1: \(B \times C = 40 \times 10 = 400\). \(A=25\). \(400 / 16 = 25\). So, \(A = (B \times C) / 16\). Let's check Row 2.
    • Row 2: \(B \times C = 9 \times 9 = 81\). \(A=81\). \(81 / 1 = 81\). So, \(A = (B \times C) / 1\). The divisor is different (16 vs 1). Let's see if the divisor follows a pattern. The divisors are 16 and 1. What about Row 3? \(B \times C = 16 \times 8 = 128\). If A is?, then \(? = 128 / k\). We need to find k. Is k related to B and C?

Discovering the Consistent Pattern

Let's look closely at the divisors in Pattern Attempt 2: 16 (for Row 1) and 1 (for Row 2). How can we get 16 from B=40, C=10 and 1 from B=9, C=9?

  • Row 1: \(B=40, C=10\). \(B/C = 40/10 = 4\). The divisor is 16. Notice \(4^2 = 16\).
  • Row 2: \(B=9, C=9\). \(B/C = 9/9 = 1\). The divisor is 1. Notice \(1^2 = 1\).

This suggests the divisor k might be \((B/C)^2\). Let's formulate the pattern:

The pattern is: The first number (A) is equal to the product of the second number (B) and the third number (C), divided by the square of the ratio of the second number (B) to the third number (C).

In mathematical terms:

\(A = \frac{B \times C}{(B/C)^2}\)

Verifying the Pattern on the Given Rows

  • Row 1: \(A = \frac{40 \times 10}{(40/10)^2} = \frac{400}{4^2} = \frac{400}{16} = 25\). This matches the first number in Row 1.
  • Row 2: \(A = \frac{9 \times 9}{(9/9)^2} = \frac{81}{1^2} = \frac{81}{1} = 81\). This matches the first number in Row 2.

The pattern \(A = \frac{B \times C}{(B/C)^2}\) holds true for both given rows.

Alternatively, we can simplify the pattern formula:

\(A = \frac{B \times C}{(B^2/C^2)} = (B \times C) \times \frac{C^2}{B^2} = \frac{B \times C^3}{B^2} = \frac{C^3}{B}\)

Let's verify the simplified pattern \(A = C^3 / B\):

  • Row 1: \(A = 10^3 / 40 = 1000 / 40 = 100/4 = 25\). This matches.
  • Row 2: \(A = 9^3 / 9 = 9^2 = 81\). This matches.

The simplified pattern \(A = C^3 / B\) is also consistent.

Calculating the Missing Number

Now, we apply this pattern to Row 3 to find the missing number (?). In Row 3, B=16 and C=8. Let A be the missing number.

Using the pattern \(A = C^3 / B\):

\(A = 8^3 / 16\)

\(A = (8 \times 8 \times 8) / 16\)

\(A = (64 \times 8) / 16\)

\(A = 512 / 16\)

Performing the division:

\(512 \div 16\)

\(512 = 32 \times 16\)

So, \(A = 32\).

The missing number in the pattern is 32.

Summary of the Solution

The pattern in the matrix is that the first number in each row is obtained by cubing the third number and then dividing the result by the second number (\(A = C^3 / B\)). Applying this pattern to the third row gives us the missing number.

Revision Table: Number Pattern Logic

Row Numbers (A, B, C) Calculation \(C^3 / B\) Result (A) Matches?
1 25, 40, 10 \(10^3 / 40 = 1000 / 40\) 25 Yes
2 81, 9, 9 \(9^3 / 9 = 729 / 9\) 81 Yes
3 ?, 16, 8 \(8^3 / 16 = 512 / 16\) 32 Calculation shows 32

Additional Information: Types of Number Patterns

Number pattern puzzles like this one test your logical reasoning and pattern recognition skills. They can involve various mathematical operations and relationships between numbers. Common types of patterns include:

  • Arithmetic sequences (adding or subtracting a constant)
  • Geometric sequences (multiplying or dividing by a constant)
  • Fibonacci-like sequences (numbers derived from previous numbers)
  • Square or cube relationships
  • Relationships between digits of numbers
  • Operations applied across rows or columns in a matrix

Solving these puzzles often requires examining differences, ratios, sums, products, and other mathematical relationships between the numbers provided to find a rule that applies consistently.

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