Add:

(19) −1, +20

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Solution

We have to compute (–1) + (+20).
Ignoring the signs and subtracting the smaller number from the bigger one, we have:
20 – 1 = 19
The magnitude 20 is bigger than 1. So, we will give 19 the sign of +20, i.e., the positive sign.
∴ (–1) + (+20) = +19

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