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18 April, 08:16

Marek thinks of 2 prime numbers that are larger than 3. He multiplies the 2 numbers together. is his answer odd or even.

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  1. 18 April, 08:21
    0
    It must be odd. As you know, 2 is the only even prime number. Therefore, all prime numbers have the form (2x+1).

    For example, two numbers are 2x+1 and 2x+5. We have:

    (2x+1) (2x+5) = 4x^2 + 12x+5

    Since 4x^2+12x is even, 5 is odd, 4x^2+12x+5 must be odd.

    Good luck!
  2. 18 April, 08:26
    0
    Im thinking it would be odd because when you multiply 2 odd numbers youre result is usually odd
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