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Five students P, Q, R, S and T are standing in a line facing North. R is standing between Q and S. P is to the immediate left of Q. T is at the extreme right end. Who is standing to the immediate right of R?
Q
S
P
T
S
Place the fixed end first (T at extreme right), then anchor the blocks (P-Q-R-S) to deduce the linear order.
Place the fixed end first (T at extreme right), then anchor the blocks (P-Q-R-S) to deduce the linear order.
Establish the fixed point
Since there are 5 students and T is at the extreme right end, the line looks like: _ _ _ _ T.
Arrange the remaining sequence
We know R is between Q and S, meaning the sequence is Q-R-S or S-R-Q. We also know P is to the immediate left of Q (P-Q). Combining these, the sequence is P-Q-R-S.
Final verification of the line
Placing the block P-Q-R-S into the empty slots before T results in: P, Q, R, S, T. In this sequence, R is between Q and S, P is to the immediate left of Q, and T is at the extreme right.
A is incorrect because Q is to the immediate left of R. C is incorrect because P is to the immediate left of Q. D is incorrect because T is at the extreme right end, not adjacent to R.
B is correct because in the arrangement P-Q-R-S-T, S is situated to the immediate right of R.
In linear puzzles, always look for the 'extreme' ends first to anchor your arrangement before fitting smaller relative blocks.