Let a = {1, 2, 3, 5} and b = {4, 6, 9}. Define a relation r from a to b by r = {(x, y) : x -y is odd natural number, x e a, y e b}. Write r in roster form.
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r = {(5,4)} a singleton set
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let the number be x
(-6)^-1 * x = ( 9 )^-1
= > 1 / 6 * x = 1 / 9
= > x = 1 / 3 x ( - 2 ) / 1
= > - 2 / 3 .
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