Paper 1 · Mathematical Reasoning and Aptitude
Find the wrong number in the following sequence: 10, 26, 74, 218, 654, 1946
A26
B74
C218
D654 ✓ Correct
Correct answer: (D) 654 — The wrong number is 654, so that is the answer.
Explanation
★The wrong number is 654, so that is the answer.
★Each term should be three times the previous term minus 4.
★10 times 3 minus 4 is 26, and 26 times 3 minus 4 is 74.
★74 times 3 minus 4 is 218, so the next term should be 218 times 3 minus 4.
★That equals 650, not the printed 654.
★So 654 is the wrong number, since it should be 650.
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