How do you solve this one?
(1) The hundreds digit of 10n is 6 SUFFICIENT
: If Hundred's place of 10n = 6 then Ten's place of n must be 6
e.g. n=68 tens place 6,
10n=680, hundreds place is 6
(2) The tens digit of n+1 is 7INSUFFICIENT
: If n=69; n+1=70 OR If n=77; n+1=77; i.e. n can have both 6 or 7 as tens place.Hence choice(A) is the answer.
Tough RCs: Passage1 | Passage2 | Passage3 | Passage4 | Passage5 | Passage6 | Passage7