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`        If tn be the nth term of an AP and if t7=9, then the value of common difference that would make t1t2t7 least is____:A)33/40     B)33/20    C)33/10`
one year ago

Arun
22540 Points
```							Dear Shiv Since T1 T2 T7/9= (9 -6d) (9-5d)= 30 d² -99d +81= 30 (d²- 99d/30) + 81= 30 (d² - 33d/10 + 33²/20²) + 81 - 30* 33²/20²= 30 ( d-33/20)² + 270/400 To make it least d - 33/20 = 0Henced = 33/20  RegardsArun (askIITians forum expert)
```
one year 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