Question
Download Solution PDFSelect the number from among the given options that can replace the question mark (?) in the following series.
5, 18, 70, 278, ?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe pattern followed here is:
(Previous number × 3) + (previous number – 2) = next number
Given: 5, 18, 70, 278, ?
1st number → 5
2nd number → (5 × 3) + (5 - 2) = 15 + 3 = 18
3rd number → (18 × 3) + (18 - 2) = 54 + 16 = 70
4th number → (70 × 3) + (70 - 2) = 210 + 68 = 278
5th number → (278 × 3) + (278 - 2) = 834 + 276 = 1110
Hence, ''1110" is the correct answer.
Alternate MethodThe logic followed here is:
The Previous number × 4 - 2 = next number.
5, 18, 70, 278, ?
5 × 4 - 2 = 18
18 × 4 - 2 = 70
70 × 4 - 2 = 278
278 × 4 - 2 = 1110
Hence, the correct answer is "1110".
Last updated on Jul 16, 2025
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