Paper 1 · Mathematical Reasoning and Aptitude
What is the number that comes next: 12, 20, 100, ?, 8900, 88900, 888900
A1000
B900 ✓ Correct
C800
D400
Correct answer: (B) 900 — The missing number is 900, so that is the answer.
Explanation
★The missing number is 900, so that is the answer.
★Look at the later terms after dividing each by 100.
★100, the missing term, 8900, 88900 and 888900 divided by 100 give 1, ?, 89, 889 and 8889.
★In that reduced series each term is the previous term times 10 minus 1.
★1 times 10 minus 1 is 9, so the reduced missing value is 9.
★Multiplying 9 by 100 gives the missing term 900.
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