which of the following statements is true and which is false? -P: if a natural number n is divisible by 3, then if 3 is no t a factor of n then n is divisible by 5. -Q: If a natural number n is divisible by 3 and 5, then 5 is not a divisor of n. -R: If 2 and 7 are factors of a natural number n, then if 7 does not divide n then 3 is a divisor of n.