Exams › SSC CGL (Prelims) › General
Find the number that follows the same pattern in the series below. 6 : 12 :: 9 : 21 :: 3 : ?
- 3
- 7
- 5
- 8
Correct answer: 7
Solution
In the pair 6:12, the second number is double the first (6×2=12). In 9:21, 9×2+3=21. For 3: using the pattern that the added amount grows — 6 added 6, 9 added 12, the differences added are 6 and 12 (multiples: ×1, ×2 of the first number). For 3: 3×2+1=7. Checking via positional differences (6, 12, 4 — no), the most consistent answer is 7.
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