Calculating Fingerprint Primary Classification using the Henry System

The primary classification of a fingerprint set is determined using the Henry Classification System. This system assigns numerical values to specific finger patterns, primarily whorls, to calculate a fraction representing the overall classification.

Understanding the Henry Classification System Formula

The primary classification is calculated as a fraction:

$ \text{Primary Classification} = \frac{\text{Numerator}}{\text{Denominator}} $

The values are assigned based on the presence of whorls on specific fingers:

• Fingers are numbered 1 to 10, starting with the Right Thumb (1) and ending with the Left Little finger (10).
• Specific fingers are assigned point values if they contain a whorl pattern:
  • Fingers 1 (Right Thumb) and 6 (Left Thumb) = 16 points each.
  • Fingers 2 (Right Index) and 7 (Left Index) = 8 points each.
  • Fingers 3 (Right Middle) and 8 (Left Middle) = 4 points each.
  • Fingers 4 (Right Ring) and 9 (Left Ring) = 2 points each.
  • Fingers 5 (Right Little) and 10 (Left Little) = 1 point each.
• Numerator Calculation: Sum the values of whorls on the **even-numbered fingers** (2, 4, 6, 8, 10) and add 1.
• Denominator Calculation: Sum the values of whorls on the **odd-numbered fingers** (1, 3, 5, 7, 9) and add 1.

Step 1: Identify Finger Patterns and Whorl Locations

Based on the question, the fingerprint patterns are:

• Whorls present on: Right Middle, Right Little, Left Index, Left Middle.
• Arches present on: Right Ring, Left Thumb.
• Loops present on: Right Thumb, Right Index, Left Ring, Left Little.

Step 2: Map Patterns to Finger Numbers and Values

Let's list each finger, its number, assigned value (if it's a whorl), and whether it contributes to the primary classification calculation:

Step 3: Calculate the Primary Classification Numerator

We sum the values for whorls found on the even-numbered fingers (2, 4, 6, 8, 10):

• Finger 2 (Right Index): 0
• Finger 4 (Right Ring): 0
• Finger 6 (Left Thumb): 0
• Finger 8 (Left Middle): 4
• Finger 10 (Left Little): 0

Sum = $0 + 0 + 0 + 4 + 0 = 4$.

Numerator = Sum + 1 = $4 + 1 = 5$.

Step 4: Calculate the Primary Classification Denominator

We sum the values for whorls found on the odd-numbered fingers (1, 3, 5, 7, 9):

• Finger 1 (Right Thumb): 0
• Finger 3 (Right Middle): 4
• Finger 5 (Right Little): 1
• Finger 7 (Left Index): 8
• Finger 9 (Left Ring): 0

Sum = $0 + 4 + 1 + 8 + 0 = 13$.

Denominator = Sum + 1 = $13 + 1 = 14$.

Step 5: Determine the Final Primary Classification

Combining the calculated numerator and denominator gives the primary classification:

$ \text{Primary Classification} = \frac{5}{14} $

Note: The calculation based on the standard Henry Classification System yields 5/14. This differs from the options provided. The solution above follows the standard methodology for determining the primary classification.