Expand a random range from 1–5 to 1–7

Question

Given a function which produces a random integer in the range 1 to 5, write a function which produces a random integer in the range 1 to 7.

1. What is a simple so

Answer 1

in php

function rand1to7() {
    do {
        $output_value = 0;
        for ($i = 0; $i < 28; $i++) {
            $output_value += rand1to5();
        }
    while ($output_value != 140);
    $output_value -= 12;
    return floor($output_value / 16);
}

loops to produce a random number between 16 and 127, divides by sixteen to create a float between 1 and 7.9375, then rounds down to get an int between 1 and 7. if I am not mistaken, there is a 16/112 chance of getting any one of the 7 outcomes.