vera_ewing
  • vera_ewing
How do you solve this?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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vera_ewing
  • vera_ewing
A particular integer N is divisible by two different prime numbers p and q. Which of the following must be true? I. N is not a prime number. II. N is divisible by pq. III. N is an odd integer.
anonymous
  • anonymous
Do you know what a prime number is?
vera_ewing
  • vera_ewing
A number that can only be divided by 1 and itself.

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More answers

anonymous
  • anonymous
yes so what do you think the answer is
vera_ewing
  • vera_ewing
Well if the prime numbers p and q were 2 and 3, respectively, then that means I. would be incorrect right?
vera_ewing
  • vera_ewing
Because then N would be 18, which is not a prime number.
vera_ewing
  • vera_ewing
Ohh wait so I. would be correct! Right? @freckles
anonymous
  • anonymous
yes
freckles
  • freckles
would there be any other options though ? for example if p and q are 2 and 3 respectively then you could say one possibly for N is 2(3)=6 doesn't 2(3) go into N=6? Also don't you mean I would be correct?
Here_to_Help15
  • Here_to_Help15
First, recall that a prime number is only divisible by itself and 1, and that 1 is not a prime number. So, statement I must be true, since a number that can be divided by two prime numbers can’t itself be prime. Next, recall that every number can be written as a product of a particular bunch of prime numbers. Let’s say that N is divisible by 3 and 5. Then, N is equal to 3 ·5 ·p1 ·p2 · · ·, where p1, p2, etc. are some other primes. So, N is divisible by 3 · 5 = 15. Statement II must be true. Finally, remember that 2 is a prime number. So, N could be 6, since 6 = 2 · 3. Statement III isn’t always true.
freckles
  • freckles
Awesome explanation by @Here_to_Help15 :)
anonymous
  • anonymous
agree
mathmath333
  • mathmath333
if N is divisible by two different prime numbers p and q then \(\large \color{black}{\begin{align} N\leq p\times q, \ \{p,q\} \in \mathbb{P} \hspace{1.5em}\\~\\ \end{align}}\) so N cannot be a prime number
anonymous
  • anonymous
ok I get it
Here_to_Help15
  • Here_to_Help15
Thanks :)
mathstudent55
  • mathstudent55
@Here_to_Help15 Great explanation, just modify it this way (add the capitalized words): "Next, recall that every NON-PRIME number can be written as a product"

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