GATE 2022 CS – Question 5
A palindrome is a word that reads the same forwards and backwards. In a game of words, a player has two plates painted with the letters A and D. From the additional plates given in the options, which one of the combinations of additional plates would allow the player to construct a five-letter palindrome. The player should use all the five plates exactly once. The plates can be rotated in their plane.
(A) plates: D, D rotated 180°, J
(B) plates: R, A rotated 180°, R rotated 180°
(C) plates: Z, E mirrored, D
(D) plates: I, L rotated, Y
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Show answer and explanation
Correct answer: (B) R, A (rotated 180°), R (rotated 180°)
Explanation
Rotating the plates gives letters R, A, R, A, D, which form the palindrome RADAR. No other option yields a valid five-letter palindrome.