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Question: discrete math 1 please explain each step and write every...

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Discrete Math 1: Please explain each step and write every detail so that I can understand for future problems. This is discrete math on so please do not make it very complicated.

Definition : For a function G : A → B and a subset C-B, the so called inverse image of C is the set of all elements a from the domain A for which 9(a) C That is,​​​​​​​Extra Problem (4 pts.): Let A Vm m is an odd natural number Show that A is countable by providing an 1-1 and ontu function f:AN.

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