



 
Hi Jeff, There is no right way to solve the game of 24 problems. The challenge is to find a correct solution, which you did! Perhaps the teacher wanted to see (21  13) × (9  6) = 8 × 3 = 24 but your solution is just as valid. I assume you got the "over 1,500 possible combinations" from the calculation 4 × 4 × 3 × 4 × 2 × 4 but the string of symbols and numbers could start with a minus sign so I get twice that many. That is of course ignoring pairs of parentheses which add more to the number of combinations. Harley  


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