A series is given with one term missimg. -40, -81, -164, -329, -660, -1321, ?
A series is given with one term missimg. Select the correct alternative from the given ones that will complete the series.
एक श्रृंखला दी गई है जिसमें से एक पद लुप्त है। दिए गए विकल्पों में से सही विकल्प का चयन कीजिए जो इस श्रृंखला को पूरा करेगा।
-40, -81, -164, -329, -660, -1321, ?
Detailed Solution & Logic
Correct Answer:
-2644
Solution
Series:
-40, -81, -164, -329, -660, -1321, ?
Check the pattern carefully:
- $-40 \times 2 -1 = -81$
- $-81 \times 2 -2 = -164$
- $-164 \times 2 -1 = -329$
- $-329 \times 2 -2 = -660$
- $-660 \times 2 -1 = -1321$
Pattern: multiply by 2 and subtract alternately:
$-1,,-2,,-1,,-2,\dots$
Now find the next term:
$-1321 \times 2 -2$
= -2642 -2
= -2644
✅ Missing term = -2644
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