What are the greatest common factors of 420 and 660?

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answer is A.

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Detailed Solution

Concept-To find the greatest common divisor, we need to know the prime factors of each number. It is possible to divide the number into different combinations. If you are familiar with the multiplication table, you can easily work out the factors. A number that has only two factors and the number itself. A given number is written as a product of prime numbers, then the product of each common prime factor multiplied by the smallest power is found.

The greatest common divisor is just the product of primes with common factors

Hence, the correct option is 1.

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