Question

. n articles are arranged in such a way that 2 particular articles never come together. The
number of such arrangements is
a) (n-2) n-1
b) (n-1) n-2
c) n
d) none of these​

Answer 1

Answer:

arrangements is

a) (n-2) n-1

b) (n-1) n-2

c) n

d) none of these