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If 3 is the least prime …

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If 3 is the least prime factor of number 'a' and 7 is the least prime factor of number 'b', then what is the least prime factor of (a+b)

Posted by Sneha Sinha 5 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 4 years, 6 months ago

Then the least prime factor of a is 2; which is not 3 or 7. So a can not be an even number nor can b be an even number. Hence a+b can not be a prime number greater than 2 if the least prime factor of a is 3 and b is 7. Thus the answer is 2.

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CBSE > Class 10 > Mathematics