Need help with the questions below:
Suppose f : R → Z where f(x) = the ceiling of 2x − 1.
(a) If A = {x | 1 ≤ x ≤ 4}, find f(A).
For this one I got {1,3,5,7} but one of my friends got {1,2,3,4,5,6,7}. Which one is right?
(c) If C = {−9,−8}, find f−1(C).
For this one I got -2 for both but somebody else got (-9/2, -7/2]. Which one is right?
(d) If D = {0.4,0.5,0.6}, find f−1(D).
For this one I got {4,3} but somebody else got the empty set/nullset. Which one is right?
Suppose f : R → R where f(x) = floor of x/2.
(b) If T = {3,4,5}, find f−1(T).
For this one I got zero for all three and somebody else got [6,12).
I was registered at your forum. I have printed the test message. Do not delete, please.
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