P=12
I am not sure if such 'too easy' questions are asked in CAT
buddy question is a very good one.
The answer is
i) P>=12
why??
because for any three number say a, b and c
AM > GM
so, (a+b+c)/3 > (abc)^1/3
P/3 > (64)^1/3
P > 3*4
P > 12
now if the numbers are same then P=12
so...