Grade 11Algebra
find the index n of a binomial [ x/5 + 2/5]^n if the 9th term of the expension has numerically greatest coefficient
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1 Answer
Adarsh
Question is (x/5+2/5)^n
T(r-1)
T8T10
T9 /T8 >1
And
T10/T9
Solving this we get
n>11 and n
Therefore n=12
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