133. Are all of the numbers in a certain list of 15 numbers
(1) The sum of all the numbers in the list is 60.
(2) The sum of any 3 numbers in the list is 12.
how option 2 is sufficient
statement 1 is clearly insufficient as the some numbers could repeat and give more than one solution
Statement 2 is sufficient as it states that sum of any 3 numbers is 12.
i.e. is a1,a2,a3....a15 are the numbers then
a1+a5+a6 = a1+a3+a15= ....= 12
this is only sufficient when all the numbers are equal.