E.g. After qualifying out of 400 professionals, 112 joined industry, 120 started practice and 160 joined as paid assistants. There were 32 who were practice and industry, 40 in both practice and assistantship and 20 in both industry and assistantship. There were 12 who did all the three.
→ find how many could not get any of these?
→ find how many joined industry and practice but not assistantship.
→ find how many started practice only.
