Answeryes
Step-by-step explanation:
The number of permutations of the 4 different letters, taken two at a time, is given by:
If a binomial

is a factor of a polynomial, then

is a root of this polynomial.
Answer:
Real numbers are "closed" under multiplication
Irrational numbers are "not closed" under division
Integers are "closed" under subtraction
Positive ration numbers are "closed"
Hope this helps! :)
A. b = 3
B. b = 2
C. b = 4
D. b = 3/2
So, here I state the answer to this problem is (B)
Have a great day.
Glad to help out!