# Solve infinitesimal questions on Wolfram|Alpha?

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 Hi there, I am trying to solve the question (0,3)[1,2] but Wolfram gives me the wrong answer the right answer must be >> (0,3) or (1,2)!!How I can type infinitesimal questions on Wolfram? I am trying to solve also this question with WolframAlpha how can I do this>> For each of the groups, determine whether it is blocked from above and blocked from above: I am trying to find the --A=(1,2)∪(5,6) --A={n-n^2 |n∈N}--A=Z∩(-100.5,∞)