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Order of Operations

If X = 1, 2...

Question

If $X = {1, 21, 32, 12}$ then find

$P =$ { $x \in X$ , such that $x$ is a prime numbers}

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Solution

$X = {1, 21, 32, 12}$
$P = ϕ ∵$ there is no prime number in the set $X$ .

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X = {1, 21, 32, 12}

Q =

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Q. Show that the statement
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