Hi,
Couldn't find this problem after considerable searching...I got it right but it was an educated guess. Could someone explain why the answer is A?
DS: If n is a positive integer and r is the remainder when 4 + 7n is divided by 3, what is the value of r?
...This means 3Q + r = 4 + 7n (where Q = quotient) and that r > 3 (ie 0,1, or 2)
Rephrased Question (RQ): r = 4 + 7n - 3Q = ?
Statement 1: n+1 is divisible by 3
...This means that n+1 has a 3 in its prime box and that n = even integer...I'm stuck after that. This seemed like it was sufficient information (if I knew what to do with it) so I guessed A
Statement 2: n > 20
...you can plug in a few values of n that satisfy this inequality and quickly see that r will change (ie if n = 30, r = 1; if n = 31, r = 2)....therefore INSUFFICIENT
Between A, C or E I guessed A using the reasoning above. Why is A correct? Thanks
Dennis