maths DOUBT

[Shefali]

If a,b are two distinct numbers both greater than unity then
a a/b<1
b a/b>1
c a+b >2root(2*a*b)
d a-b >2root(2*a*b)

[Homer Simpson]

options c and d are same - are they 2x root over (2ab)? is that the expression u meant to write? please confirm

[Shefali]

now check tsuki

[Dreyfus]

Its c....am is always greater than gm when no. r positive