What is the binomial coefficient in binomial Why does 32 = 2 ^ (n-1) in the sentence "the sum of binomial coefficients of odd items in binomial expansion of (√ X-2 / x) ^ 2 is 32" That's x minus two parts of X under the root sign (I can't get the root ~ hehe)

What is the binomial coefficient in binomial Why does 32 = 2 ^ (n-1) in the sentence "the sum of binomial coefficients of odd items in binomial expansion of (√ X-2 / x) ^ 2 is 32" That's x minus two parts of X under the root sign (I can't get the root ~ hehe)

The binomial coefficient is the combination number
That's CNK

The absolute value of a number cannot be negative,

Yes

The absolute value of positive number 1-A is____ The absolute value of negative A-1 is_____

The absolute value of positive number 1-A is [1-A], and the absolute value of negative number A-1 is [1-A]