Are all of the numbers in a certain list of 15 numbers equal?
(1) The sum of all the numbers in the list is 60.
(2) The sum of any 3 numbers in the list is 12.





From 1)
Insuff.
From 2)
when the problem says that the sum of ANY 3 numbers in the list is 12, it's not kidding. this means that if you select literally any possible group of three numbers out of the fifteen, then they must add up to 12....
Ans - B