Which of the following pairs of sets are equals? Give reasons.
(i) A={-1,1} and B=`{x:x in R and 3x^(2)-3=0}`
(ii) A={1,2,3} and B=`{x: x in R and (x-1) (x+2)=0}`
(iii) A=(-4,-3,-2,-1) and B=`{x:x in N and x^(2) lt 20}`

Explanation

To determine which pairs of sets are equal, we need to analyze each pair and check if they contain the same elements.

### Solution:

**(i)** Let \( A = \{-1, 1\} \) and \( B = \{x : x \in \mathbb{R} \text{ and } 3x^2 - 3 = 0\} \).

1. **Solve for B**:
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