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Find the 5th Term in the Binomial Expansion (ab)n( a - b ) ^ { n }

Question 275

Multiple Choice

Find the 5th term in the binomial expansion. (ab) n( a - b ) ^ { n }


A) n!(n5) !5!an5b5\frac { n ! } { ( n - 5 ) ! 5 ! } a ^ { n - 5 } b ^ { 5 }
B) (n4) !(n4) !4!an4b4\quad \frac { ( n - 4 ) ! } { ( n - 4 ) ! 4 ! } a ^ { n - 4 } b ^ { 4 }
C) n!(n4) !4!an4b4\frac { n ! } { ( n - 4 ) ! 4 ! } a ^ { n - 4 } b ^ { 4 }
D) n!(n4) !an4b4\frac { n ! } { ( n - 4 ) ! } a ^ { n - 4 } b ^ { 4 }
E) n!(n5) !5!an5bn\frac { n ! } { ( n - 5 ) ! 5 ! } a ^ { n - 5 } b ^ { n }

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