Mathematics, 04.12.2020 05:50, ballbritez

Everyone is getting this right but I still dont get it! pls help By putting suitable signs + , − , × , ÷ , ( , ) in-between the digits 9 9 9 9 many numbers can be generated, for example, 9 × (9 + 9) + 9 = 171.

Which of the following numbers can be generated this way?
−6
−5
−4
4
5
6
7

Answers: 2

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Everyone is getting this right but I still dont get it! pls help By putting suitable signs + , − ,...