Question: Which of the following expressions are valid? Select the three correct answers. (a) (- 1 -) (b) (+ + 1) (c) (+-+-+-1) (d) (1) (e)

Which of the following expressions are valid?

Select the three correct answers.

(a) (- 1 -)

(b) (+ + 1)

(c) (+-+-+-1)

(d) (—1)

(e) (1 * * 1)

(f) (- -1)

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