Answer:
THE ANSWER IS 9 CDS THANK ME LATER
Step-by-step explanation:
Hello,
N is closed for an opération(µ) means that
a,b ∈ N : a µ b ∈N (i suppose so)
Answer (1) ex 2/3 ∉ N
Answer (4) ex 2-3 ∉ N
∀ a,b ∈ N: a+b ∈N is true ; not a answer.
∀ a,b ∈ N: a*b ∈N is true ; not a answer.
No no yes yes
please mark brainliest
It's D. 311 divided by 12 is 25.9