Posted by m on Wednesday, October 20, 2010 at 9:53am.
Give a counterexample to show that each of the following generalizations about the set of integers {3,2,1,0,1,2,3} is false.
a) closure property for division
b) distributive property for division over addition.

math  MathMate, Wednesday, October 20, 2010 at 10:54am
a. Closure property for division means that the result of the division of numbers in the given set belongs to the set.
For example, for the set {1,1}, the closure for division is true, because (1/1)=1, and (1/1)=1. So all possible divisions of numbers in the set yield a result also in the set.
For the set {1,2}, closure for division is not true. Although 2/1=1 is in the set, 1÷2 = 1/2 is not in the set. So 1÷2 is a counter example of closure.
Try to figure out a few counter examples, and post if you have doubts.
b. Distributive property of multiplication over addition is the following:
5*(2+3)=5*2+5*3=25
Does this work for division?
5/(2+3)=? 5/2 + 5/3 = 25/6 = 4 1/6
The preceding example is a counter example of the distributive property for division over addition.
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