Numbers Questions

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Validate if input number is prime

Trying to write a program that checks if a number is prime. wrote the below code, but do not understand why do i have an output of 2 lines:
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Select range in SQL

I have a sql database that have invoicenumber column now i need to select range between two numbers, but i don't know what happened.
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What parameters to set as main loop

Okay, so i have a homework question, which goes as follows: from the array make pairs (b, c) where b is lowest even number, and c is biggest.
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Python number formatting

I have an issue with formatting number output in python. i found quite some examples how to do it with .format(), but i can not
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Limit decimal points in a float

I am trying to limit my decimal places to 2 while printing the value of pi. below is my expression after installing the match module in
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Sorting list of names in Perl

I am trying to learn perl and i am quite new with it probably less than a week. i want to sort a list of names(in this case fruits) and
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