Php
1.prime < html > < style > body { background-color : lightblue ; } </ style > <?php function isPrime ( $n ) { if ( $n <= 1 ) return false ; for ( $i = 2 ; $i <= sqrt ( $n ); $i ++) { if ( $n % $i == 0 ) return false ; } return true ; } $start = 3 ; $end = 20 ; $count = 0 ; for ( $i = $start ; $i <= $end ; $i ++) { if ( isPrime ( $i )) { echo " $i \t " ; $count ++; } } echo " <br>The Total number of Prime numbers are = $count " ; ? > </ html > 2)Messgeg Passing < html > ...