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The coefficient of a4b5 in the expansion of (a + b)9 is

Option: 1

\frac{9 !}{4 ! 5 !}


Option: 2

\frac{9 !}{6 ! 3 !}


Option: 3

\frac{4 ! 5 !}{9 !}


Option: 4

none of these 

 


Answers (1)

best_answer

Coefficient of a4b5 will be \frac{9 !}{4 ! \times 5 !} Hence (A) is the correct answer

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