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`        plxxx tell que.18...... Arithmetic progression.......answer fast`
4 months ago

Arun
23325 Points
```							Dear student 2b = a + c 2b^2 = a^2 + c^2 hence2(a + c)^2 /4 = a^2 + c^2 a^2 + c^2 + 2ac = 2 a^2 +2 c^2 hence (a – c)^2 = 0 a = c hence a = b = c
```
4 months ago
Rajat
212 Points
```							2b= a+c2/b^2 = 1/a^2 + 1/c^2Thus 8/(a+c)^2 = (a^2+c^2)/(ac)^2By AM GM inequality,(a^2+c^2)/2≥acAnd, (a+c/2)^2 ≥acThus, 8/(a+c)^2≤ (a^2+c^2)/(ac)^2So a=c thus a=b=c
```
4 months ago
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### Course Features

• 101 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions