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10 questions from this quiz
Assume the opposite of what you want
'a contradiction'
Not all numbers are even
At least one multiple of 222 isn't of 333
There exists a greatest integer kkk
n2=2(2a2)n^2 = 2(2a^2)n2=2(2a2) which is even
2k+12k + 12k+1 (odd)
No common factors
a2a^2a2 is even, so aaa must be even
They have no common factors
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