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There are six prime numbers that are less than 15: 2 3 5 7 11 and 13

6 of them.

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U={x/x is an odd prime number less than 15}, A={2,7,13} , and B={7,13} what is Ac U B?

Q: How many prime numbers are less than 15?

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One of them.

One: 97

Prime numbers less than 13 are: 2, 3, 5, 7 and 11

120*1div2*2div3*4div5=32

There is only one prime number which is even - that is 2 - and it also happens to be less than 100. All other prime numbers are odd.

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