Not First, Not Last
Six people, including Ann and Bob, stand in a single row for a photograph. Ann refuses to stand at the left end, and Bob refuses to stand at the right end. In how many orders can the six people stand? Give an integer.
Related problems & prerequisites
Worth solving first
- Threes and Fives 2.0/10
Source: Classic counting exercise in wide circulation; no traceable original source. Statement written for AxiomIQ.