Answer:
Ann had 48 fliers to post around town
Last week, she posted 2/3 of them

Therefore, she should posted 32 fliers
This week, she posted 3/8 of the remaining fliers

Therefore, she should posted 18 fliers
Total fliers she should post are (32+18)=50 fliers
She still did not post (50-48)= 2 fliers
2 fliers is the right answer.