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20 April, 15:59

Circle A contains all positive odd numbers; circle B contains all factors of 33, and circle C contains all prime numbers. How many numbers belong to all three circles?

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  1. 20 April, 16:29
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    3 and 11 are the only two because 33 only has four factors: 1,3,11,33.

    1 - in some cases people say this is prime, but it is now widely considered to not be a prime number

    3 - prime

    11 - prime

    33 - not prime, divisible by 3 and 11
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