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`        If (1+x+2x²)^10=a′+a1x+a2x²+.....+a20x^20,then a′+a2+a4+........a20 is equal to `
one year ago

Arun
23359 Points
```							When x = 1 Then ao + a1 +a2+ a3+ a4+........+a20 = 4^10 When x = -1 ao -a1+a2-a3 +a4- ............+a20 = 2^10 Now add both the equations (ao + a2 + a4+ a6+......+ a20) = 1/2 (4^10 + 2^10)  Hope it helps
```
one year ago
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### Course Features

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