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`        If (1+2x+3x2)10 = ao+ a1x + a2x2+.......+ a20x20 ,. then a1 equals :`
one year ago

Amarjeet Jayanthi
11 Points
```							(1+2x+3x2)10=[(1+2x+x2)+2x2]10=[(1+x)2+(2x2)]10.The coefficient of x in (1+2x+3x2)10 is the coefficient of x in [(1+x)2+(2x2)]10In the expansion [(1+x)2+(2x2)]10 all the terms contain x2 except the first term.The first term is [(1+x)2]10=(1+x)20 and the coefficient of x is 20.Answer=20.
```
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