I answered as I much as I could, but now I am stuck.
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I need help with these problems. I answered as I much as I could, but now I am stuck. 

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6)You are given the set X of all natural numbers that are 1 or 2 more than a multiple of
10, in other words you are given X as {1,2,11,12, 21, 22, 31, 32------------}
B1: 1 is in X
B2: 11 is in X

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