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`        The coefficient of x5 in (1 +2x+3x2+........)-3/2 is `
one year ago

Prasant Sahu
19 Points
```							The series is: (1 +2x+3x2+........)-3/2  There are two series in the expression, one is the number series: (1+2+3+.....) and other one is alphbetical series : (x^0+x^1+x^2+.........), and it is observed that the coefficient of x is greater by one than the exponent . Therefore , the answer is 6.
```
one year ago
35 Points
```							the terms in the equation is in the form of (n+1)Xn form therefore,  we need the coefficient of X5then (5+1)X5=6X5 and it is multipllpying with -3/2 therefore the coefficient is -9
```
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