Alexis surveys three different samples of 20 students selected randomly from the population of 492 students in the seventh grade
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Answer:
Explanation:
Binomial expansion is:
Here in given expression we have a=x , b=-2y and n = 13
general formula for binomial expansion is:
Since,
r should be one number less than the term we need to find so it will become the number we need to find like here we have to find 9th term so, r=8
substituting the values in the genral formula we will get
After substituting the values we will get
After simplification we will get
which will be the 9th term of the expansion