Practice NAT questions with answers and explanations.
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The series alternates from the beginning and end of the alphabet.
After C and X, the next beginning letter is D.
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The letters are initials of the days from Sunday onward.
The sixth day in the sequence is Friday.
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Each pair contains consecutive letters, and each new pair starts three positions later.
After JK, the next pair is MN.
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Each letter is four positions after the previous one.
P plus four positions gives T.
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The first letters move forward while the second letters move backward.
After D-W comes E-V.
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The first letters advance and the second letters retreat.
After D-U comes E-T.
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Each position in the three-letter group advances by one letter.
Thus, CEG becomes DFH.
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The jumps are +2, +3, +4, and +5.
The next jump is +6, taking P to V.
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The backward jumps are 3, 4, and 5 letters.
The next jump is 6, taking M to G.
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The forward jumps are 1, 2, 3, and 4.
The next jump is 5, taking K to P.
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The terms follow n(n + 1): 1×2, 2×3, 3×4, and so on.
The next term is 6×7 = 42.
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The operations alternate between multiplying by 3 and dividing by 2.
After 18, multiply by 3 to get 54.
