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RonrickDaano
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How many 3 digit positive integers N are there, such that N is a multiple of both 7 and 13?
 2 years ago
 2 years ago
RonrickDaano Group Title
How many 3 digit positive integers N are there, such that N is a multiple of both 7 and 13?
 2 years ago
 2 years ago

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Mertsj Group TitleBest ResponseYou've already chosen the best response.1
If the number is a multiple of both 7 and 13, it must be a multiple of 91. So find the multiples of 91 between 100 and 1000.
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.1
100<91n<1000 1<n<11
 2 years ago

matricked Group TitleBest ResponseYou've already chosen the best response.0
as both 7 1nd 13 are primes the required number is [1000/91] 1 (as 91 itself is less than 100) =10 1 =9
 2 years ago
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