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Number Series

1 UPSC Prelims MCQs tagged "Number Series". Free practice with answer keys, explanations, and timed mock tests on Anantam IAS.

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Select the missing number from the given series: 98, 70, 42, 14, ?, -42
Select the missing number from the given series: 98, 70, 42, 14, ?, -42
1. A-10
2. B-14
3. C0
4. D-15
Answer and explanation
Correct answer: B
Each term decreases by a constant 28: 98 minus 28 is 70, 70 minus 28 is 42, 42 minus 28 is 14. So the next term is 14 minus 28, which is -14, and -14 minus 28 gives -42, matching the last term.
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CSAT UPSC GPSC-2026 Easy