anonymous
  • anonymous
How many 3 digit positive integers N are there, such that N is a multiple of both 7 and 13?
Collaborative Statistics
chestercat
  • chestercat
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Mertsj
  • Mertsj
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.
Mertsj
  • Mertsj
100<91n<1000 1
anonymous
  • anonymous
as both 7 1nd 13 are primes the required number is [1000/91] -1 (as 91 itself is less than 100) =10 -1 =9

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