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Find the coefficient of x\(^3\)y\(^2\) in the binomial expansion of (x-2y)\(^5\)

Further Mathematics
WAEC 2022

Find the coefficient of x\(^3\)y\(^2\) in the binomial expansion of (x-2y)\(^5\)

  • A. -80
  • B. 10
  • C. 40
  • D. 80
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Correct Answer: Option C
Explanation

x\(^3\)y\(^2\) in (x-2y)\(^5\)


n = 5, r = 3, p = x, q = -2y

 

5C\(_3\) * x\(^3\) -2y\(^2\)

5C\(_3\) = \(\frac{5!}{[5-3]!3!}\)

\(\frac{5*4*3!}{2! 3!}\) →  \(\frac{5*4}{2}\)

5C\(_3\) = 10

: 5C\(_3\) * x\(^3\) -2y\(^2\) = 10 *  x\(^3\) 4y\(^2\)

 40x\(^3\)y\(^2\)
the coefficient is 40

 


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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