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I agree with everyone below that this problem & answer are sub-par and likely incorrect.
We probably need to modify / adjust this problem to not be so simplistic in the answer...there is a pretty involved discussion here on stackexchange about set operator precedence and how parentheses are needed to disambiguate the order of operations.... it does not appear to be as simple as left to right:
Relational Algebra - 4
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I agree with everyone below that this problem & answer are sub-par and likely incorrect.
We probably need to modify / adjust this problem to not be so simplistic in the answer...there is a pretty involved discussion here on stackexchange about set operator precedence and how parentheses are needed to disambiguate the order of operations.... it does not appear to be as simple as left to right:
https://math.stackexchange.com/questions/266182/order-of-precedence-of-set-operators