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- $age = $_GET['age'];
- $i = 10;
- $d = 10;
- if($age <= 0) {
- echo "Число должно быть 0 или больше 0";
- } elseif($age >= 1) {
- while($d <= $age){
- $d += 2;
- $i += $d;
- echo $i;
- }
- }
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