book Maths Puzzle Numerical Ability

Hi Tutors:
I am on the last problem of my homework and I need help. Please help me find the domain and range of this problem. x^2+2x/|10x-20|

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book Other Question

What is a domain? Tickets are numbered 1 to 50 and placed in a box. Three tickets are drawn at random without replacement. What is the probability that their numbers are all greater than 25?