Hard
The function calcPGCD is used to calculate the Greatest Common Divisor of two numbers a and b (0<=b<=a and a=qb +r):
function calcPGCD(a, b) {
r = a%b;
If r != 0 {
a <-- b;
b <-- r;
display calcPGCD(a, b);
}
}
What does this code display when a is 21 and b is 15?
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