The RCSP Attack Plan for Any Pattern

🎯 Learning Objective

Apply a fixed 4-check routine — Rotation, Count, Symmetry, Position — to crack any unseen series or odd-one-out figure.

💡 Concept

• Check 1 — ROTATION: is each figure a turned version of the previous one? Is one option a mirror image while the rest are rotations?
• Check 2 — COUNT: count lines, dots, corners and enclosed regions in every figure; three counts agree, one disagrees → found the odd one
• Check 3 — SYMMETRY: does every figure have the same symmetry (vertical, horizontal, none) except one?
• Check 4 — POSITION: where does each element sit (clock position, corner, centre) and how does that seat shift frame to frame?
• Run the checks in this order — rotation and count crack about 80% of questions before symmetry is even needed
• Remember the order as RCSP: Rail Coach Seat Position

✏️ Easy Example

Q. Four figures each show one arrow and one dot on a circle: (a) arrow at 12, dot at 6; (b) arrow at 3, dot at 9; (c) arrow at 6, dot at 12; (d) arrow at 9, dot at 12. Find the odd one.

1. Rotation check: measure the arrow-to-dot gap in each
2. In (a), (b), (c) the dot sits exactly opposite the arrow — 180° apart
3. In (d) the gap is only 90° (9 o'clock to 12 o'clock)

Answer: (d) — its dot is not opposite the arrow

🇮🇳 Real-Life Example

Spotting the one different coach in a rake — among all sleeper coaches, the lone AC coach stands out the moment you compare windows. Compare a FEATURE, not the whole coach.

📝 Exam-Level Example

Q. Series: frame 1 has an arrow at 12 and a dot at 6; frame 2 has the arrow at 3 and dot at 9; frame 3 has the arrow at 6 and dot at 12. What does frame 4 show?

1. R-check: arrow moves 12 → 3 → 6, i.e. 90° clockwise each step
2. Dot moves 6 → 9 → 12 — same 90° clockwise rule
3. Apply once more: arrow 6 → 9, dot 12 → 3

Answer: Arrow at 9, dot at 3

📝 Exam-Level Example

Q. Odd one out: four figures contain (a) 4 lines, (b) 6 lines, (c) 8 lines, (d) 9 lines. Nothing rotates. Which is odd?

1. R-check gives nothing, so move to C-check: count
2. Counts are 4, 6, 8, 9 — three even numbers, one odd

Answer: (d) with 9 lines — the only odd count

🪄 Memory Trick

In odd-one-out, hunt for the MIRROR trap first: three options are rotations of one figure and the fourth is its mirror image. If rotating option 1 in your head can produce options 2 and 3 but never option 4 — option 4 is the answer.

⚠️ Common Mistakes

• ❌ Staring at the whole figure for a 'feeling' instead of running the four checks one by one
• ❌ Confusing a mirror image with a rotation — a rotation can never turn a left-bending element into a right-bending one
• ❌ Stopping after one matching option in series questions — verify your rule reproduces EVERY given frame

🏆 Exam Tips

• ✅ Spend 10 seconds per check and move on — RCSP finishes in under a minute even in the worst case
• ✅ Write tiny counts (lines, dots, corners) beside each option; written numbers do not lie under pressure

📌 Summary

• RCSP order: Rotation → Count → Symmetry → Position
• Rotation and count alone solve most questions
• Mirror-vs-rotation is the classic odd-one-out trap
• A rule must explain every frame, not just one