Elance Exams Answers PDF file

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What will be the @arr value after executing: my @arr = grep { $_ > 0 } map { $_ * $_ } (1, -1, 2, -2);

@arr = (1, 4, 1, 4)
@arr = (1, 2)
@arr = (1, 4)
@arr = (1, 1, 4, 4)
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