Greatest Common Divisor (GCD) of 4, 19 and 21

The Greatest Common Divisor (GCD) of 4, 19 and 21 is the largest positive integer that equally divides all three numbers: 4, 19 and 21. Mathematically, the problem we are solving is:

GCD(4,19,21)

To solve the problem, we will list all the positive integers (divisors) that can be divided into 4, 19 and 21. We will then compare the lists of divisors to find the greatest divisor they have in common.

Divisors of 4:
1, 2, and 4.

Divisors of 19:
1 and 19.

Divisors of 21:
1, 3, 7, and 21.

When we compare the lists of divisors above, we see that the largest number they have in common is 1. Thus, the Greatest Common Divisor (GCD) of 4, 19 and 21 is:

GCD(4,19,21) = 1

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Greatest Common Divisor (GCD) of 4, 19 and 22
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