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If $A_i = \{-i, \dots , -2, -1, 0, 1, 2, \dots , i \}$ then $\cup_{i=1}^\infty A_i$ is

1. Z
2. Q
3. R
4. C

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Option: A
Option (A) - as this is the union of all Integers from -$\infty$ to +$\infty$