SOLUTION: a stock broter dealt with 30 customers on a certain day of there, 12 bought and sold stocks and 17 sold stocks (but did not buy). How many of the customers brought stocks (but did
Hi
30-12(B&S) = 18
18-17(S)= 1
How many of the customers brought stocks (but did not sell) ONE
18 + 17 + 1 = 30 CHECKS!
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