Which among the following pairs of the numbers are co-prime numbers?

$171, 90$

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$127, 128$

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$290, 44$

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$305, 120$

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Solution

The correct option is B
$127, 128$

Two consecutive numbers are always coprime numbers because their HCF is always $1$ .
Hence, both the numbers are consecutive so they are coprime numbers.

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Which of the following pairs of numbers are co-primes?
52, 143

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