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Seven people, A, B, C, D, E, F and G, are sitting in a row, facing north. Only five people sit between C and D. B sits third from the right end. G sits to the immediate right of C. E sits third to the right of A. How many people sit between G and F?
Four
Three
One
Two
One
Fix the anchor position from the right end first, then place elements relative to each other using absolute distances.
Fix the anchor position from the right end first, then place elements relative to each other using absolute distances.
Step 1: Determine Row Size and B's Position
There are 7 people sitting in a row facing North. B sits third from the right end, which means B is at position 5 from the left (7 - 3 + 1 = 5).
Step 2: Place C and D
Only five people sit between C and D. In a row of 7 people, this means C and D must occupy the two extreme ends (positions 1 and 7). Since G sits to the immediate right of C, C must be at position 1 and G at position 2, leaving D at position 7.
Step 3: Position A, E, and F
E sits third to the right of A. With positions available, A sits at position 3 and E at position 6. The remaining person F takes the remaining empty position 4 or 7 (D is at 4, F at 7).
Step 4: Count People Between G and F
Arrangement from left to right: C(1), G(2), A(3), D(4), B(5), E(6), F(7). The people between G (pos 2) and F (pos 7) are A, D, B, and E, which is exactly Four people.
A: 'Three' is incorrect because positions between G and F contain 4 people. B: 'One' is incorrect as it underestimates the gap. D: 'Two' is incorrect because positions 3, 4, 5, and 6 lie between 2 and 7.
C is correct because the exact seating arrangement from left to right is C, G, A, D, B, E, F, placing exactly four people (A, D, B, E) between G and F.
Always fix anchor positions like 'nth from the end' first, then use extreme ends constraint conditions (like maximum people between two entities) to pin down boundary elements instantly.