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`        in a sequence of 21 terms the first 11 terms are in AP with common difference 2 and the last 11 terms are in GP with common ratio 2. if the middle term the AP is equal to the middle term of GP. Then the middle term of entire sequence is?`
11 months ago

1670 Points
```							note that last term of the AP is equal to first term of the GP.a11= a1+10*2= 20+a1middle term is a6= a1+5*2for gp, middle term is a11*2^5= 32a11= 32(20+a1)= a1+5*2so 31a1=10-640=-630or a1= -630/31middle term of entire sequence is  20+a1 20-630/31-10/31
```
11 months ago
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• 101 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions