What is the HCF of 391, 667 and 1,219?

1Correct answerYour answer13Correct answerYour answer17Correct answerYour answer23Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer D

Correct answer: D

$391 = 17 \times 23$ .
$667 = 23 \times 29$ .
$1219 = 23 \times 53$ .
The only prime common to all three is 23.

Worth noting

17 divides only 391, and 13 divides none of them. It is tempting to answer 1 when no small prime divides all three, but they share the larger prime 23.

Concept: HCF of three numbers
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What is the HCF of 391, 667 and 1,219?

Explanation