Which pair of figures has the same number of faces as vertices? triangular prism and triangular pyramidtriangular prism and rectangular prismrectangular pyramid and triangular pyramidrectangular pyramid and rectangular prism?

We know that
1) A triangular prism
has 6 vertices
has 4 faces

2) A triangular pyramid
has 4 vertices
has 4 faces

3) A rectangular prism
has 8 vertices
has 6 faces

4) A rectangular pyramid
has 5 vertices
has 5 faces

therefore 
the answer is 
rectangular pyramid and triangular pyramid

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.