Question

when do we use ± sign ??
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Answer 1

The plus–minus sign, ±, is a mathematical symbol with multiple meanings. In mathematics, it generally indicates a choice of exactly two possible values, one of which is obtained through addition and the other through subtraction. ... The sign may also represent an inclusive range of values that a reading might have.

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Answer 2

Answer:

We use the plus sign to denote addition of quantites

Explanation:

I'm not quite sure but it was worth a try