Patterns problem

Test Preparation SAT Preparation
1

I’m quite confused on this problem. Why is the answer B? Wouldn’t {N} be 350? Also, what digit is it talking about when there are three digits for each number in the answers provided?

For any positive integer N, the symbol {N} represents the number obtained when every digit of N, except the leftmost digit, is replaced by its corresponding digit in the second column of the table above. For which of the following is {N} less than N?

a.) N = 349
b.) N = 394
c.) N = 487
d.) N = 934
e.) N = 984

TABLE
N {N}
0 1
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 0

2

Read the problem carefully.

Basically, every digit except the leftmost one is incremented by 1 (except 9 goes to 0). So what is {394}?

3

Oh. So 3 stays, 9 becomes 0, and 4 becomes 5, right (thus 305)?

4

Yep.

5

Thanks, man.