Professor must randomly select 4 students to participate in a mock debate. there are 18 students in his class. in how many different ways can these students be selected, if the order of selection does not matter?

Which is a logical conclusion based on the given information? a. figure abcd is a rhombus by the definition of a rhombus. b. segment ac is congruent to segment dc by cpctc. c. angle acb is congruent to angle adc by the angle-side-angle theorem. d. triangle acd is congruent to triangle cab by the hypotenuse-leg theorem.