Delhi Police Constable
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Delhi Police – Order & Ranking / क्रम व रैंक

🎙 Concept / आधार

Order & Ranking में किसी व्यक्ति/वस्तु की position (स्थान) एक queue, line या group में ज्ञात करनी होती है। Important concepts: Left–Right position, total persons, between count, after-before logic.

✔ Key Formulas / मुख्य सूत्र

✔ Solved Examples (Delhi Police Pattern)

Example 1:
A is 4th from left and 6th from right. Find total persons.
Total = 4 + 6 − 1 = 9
Example 2:
In a row of 15 persons, A is 7th from left. Position from right?
Right = Total − Left + 1 = 15 − 7 + 1 = 9
Example 3:
A is 10th from left, B is 14th from left. How many between?
Between = 14 − 10 − 1 = 3
Example 4:
A is 5th from right in a group of 20. Position from left?
Left = 20 − 5 + 1 = 16
Example 5:
In a line A is 6th from left and B is 7th from right. Total persons = 12. Find persons between A & B.
Left(B)=Total−Right+1=12−7+1=6 Positions equal → 0 between

✔ Practice MCQs

  1. A is 8th from left and 5th from right. Total persons?
    Ans: 12
  2. In row of 30, A is 12th from left. Position from right?
    Ans: 19
  3. A is 4th, B is 9th from left. Persons between?
    Ans: 4
  4. In group of 50, A is 20th from right. Position from left?
    Ans: 31
  5. A is 6th from left, B is 10th from left. Persons between?
    Ans: 3
  6. A is 3rd from right in line of 18. Position from left?
    Ans: 16
  7. A is 7th from left, B is 7th from right, total 13. Between?
    Ans: 0
  8. In row of 40, A is 25th from left. From right?
    Ans: 16
  9. A is 8th from right, total 20. From left?
    Ans: 13
  10. A is 10th, B is 14th from left. Between?
    Ans: 3

🔥 Challenge Question

A is 12th from left, B is 15th from right in a row of 24. How many people are between them?

Left(B) = 24 − 15 + 1 = 10 Difference = |12 − 10| = 2 Between = 2 − 1 = 1

Motivation: Order & Ranking पूरा formula-based है — बस 3 मिनट के अंदर पूरा topic मजबूत! 🚓🔥

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