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What should come in place of the question mark (?) in the given series? 34 34 46 46 58 58 70 70 ?
84
88
90
82
82
Observe that every number repeats twice (34, 34 | 46, 46 | 58, 58 | 70, 70). The unique terms increase by +12 each time (34 тЖТ 46 тЖТ 58 тЖТ 70 тЖТ 82). Since 70 is already repeated, the next term must be 70 + 12 = 82.
Observe that every number repeats twice (34, 34 | 46, 46 | 58, 58 | 70, 70). The unique terms increase by +12 each time (34 тЖТ 46 тЖТ 58 тЖТ 70 тЖТ 82). Since 70 is already repeated, the next term must be 70 + 12 = 82.
Analyze the Repeating Pair Structure
The given series is: 34, 34, 46, 46, 58, 58, 70, 70,? Notice that each number appears in pairs: (34, 34), (46, 46), (58, 58), (70, 70).
Identify the Inter-Pair Addition Pattern
Look at the pattern between successive unique terms: 34 + 12 = 46 46 + 12 = 58 58 + 12 = 70 70 + 12 = 82
Determine the Missing Term
Since 70 has already appeared twice (70, 70), the next position marked by (?) requires the first instance of the next paired term in the sequence: 70 + 12 = 82.
A: 84 is incorrect because adding 12 to 70 yields 82, not 84. B: 88 is incorrect because it mistakenly adds 18 to 70. C: 90 is incorrect because it incorrectly assumes an addition of 20 to 70.
D is correct because the sequence advances by adding +12 to each repeated pair of numbers, making the next number 70 + 12 = 82.
When terms repeat back-to-back in a number series, group them as pairs or look at alternate positions to find the common constant difference quickly.
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