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If every element of B is the image of some element of A under function of: A – B
is injective
Or surjective

By Maya

If every element of B is the image of some element of A under function of: A – B
is injective
Or surjective

About the author
Maya

2) Find the number which when multiplied by 2/9 we
get 1.​


What is the area of the triangle BCD?
Draw another triangle of the same area.
How many such triangles can be down?

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