Astudent is required to work exactly ten problems from a twenty-problem exam. in how many ways can the problems be chosen?

10 out of 20 ways

Step-by-step explanation:

If he has to work exactly 6 out of 10 and 3 out of the first 4, then he must work exactly 3 out of the last 6. Hence, the answer to this question is to be found in the sum of the number of ways to select 3 things from 4 things plus the number of ways to select 3 things from 6 things:

You can do your own arithmetic.

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what is all that apply?

a net is a diagram that shows a “flattened” view of a solid. in a net, each face and base is shown with all of its dimensions. a net can also serve as a pattern to build a three-dimensional solid.

a pyramid is a three-dimensional object with a base that is a polygon and triangular faces that meet at one vertex.

" the net of a triangular pyramid consists of four triangles. the base here we are given of the pyramid is a equilateral   triangle, and the lateral faces are also triangles "