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The coefficient of x3 in the binomial expansion of   
  • a)
    792m5
  • b)
    942m7
  • c)
    330m4
  • d)
    792m6
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The coefficient ofx3 in the binomial expansion of a)792m5b)942m7c)330...
T(r+1) = 11Cr x(11-2r) (m/r)r (-1)r
= 11Cr x(11-2r) mr (-1)r
Coefficient of x3 = 11 - 2r = 3
8 = 2r 
r = 4
T5 = 11C4 x3 m4 (-1)
Coefficient of x3 = 11C4 m4
= 330 m4
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The coefficient ofx3 in the binomial expansion of a)792m5b)942m7c)330...
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The coefficient ofx3 in the binomial expansion of a)792m5b)942m7c)330m4d)792m6Correct answer is option 'C'. Can you explain this answer?
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