Question

how do you solve a binomial question

Answer 1

show up the question.

Answer 2

Suppose that 90% of students taking English pass the course What is the probability that at least 2 in a class of 20 will fail the course

Answer 3

binomial theorm is nothing to find order of nth term of calculation
suppose
\[(x+a)^{1}=1co x^{1 }+1c1 a^{1}\]
\[(x+a)^{2}= [2co x ^{2} a ^{0}+ 2c1 x ^{1}a ^{1}+2c2 x ^{0}a ^{2}\]
.....
\[(x+a)^{n}= nc0 x ^{n}a ^{0}+ nc1 x ^{n-1}a ^{1}+ nc2 x ^{n-2}a ^{2}+............+ncn-1.x ^{1}+a ^{n-1} +ncn x ^{0}a ^{n}\]