The series given below contains a sequence of numbers. Accordingly identify the incorrect combination. 5, 8, 16, 19, 39, 41, 81
39, 81
The intended pattern alternates between “+3” and “×2”:
\(5 \xrightarrow{+3} 8 \xrightarrow{\times 2} 16 \xrightarrow{+3} 19 \xrightarrow{\times 2} ? \xrightarrow{+3} ? \xrightarrow{\times 2} ?\)
Compute the expected terms from this rule:
\(19 \times 2 = 38,\quad 38 + 3 = 41,\quad 41 \times 2 = 82\)
So the correct series should be 5, 8, 16, 19, 38, 41, 82.
Comparing with the given series:
\(5,\ 8,\ 16,\ 19,\ \boxed{39},\ 41,\ \boxed{81}\)
The numbers 39 and 81 deviate from the pattern (should be 38 and 82). Hence the incorrect combination is 39, 81 — option (3).
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Important Questions from Number Series
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दिए गए विकल्पों में से वह संख्या चुनिए जो निम्नलिखित श्रृंखला में प्रश्नवाचक चिन्ह (?) को प्रतिस्थापित कर सके।
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Select the correct option that will fill in the blank and complete the series.
45, 49, 58, 74, .........
