Is the range of a set of ten different even integers less than 20?
(1) The product of the ten integers is negative. INSUFFICIENT
(2) All ten integers have two digits. INSUFFICIENT
Should be C.
Considering the least possible range we get a set of 2-digit even integers from -10 to 26 (or -26 to 10), which is 36. Any other set of values (satisfying both statements 1 and 2) will always give a bigger range.