Answer:
huh'?
Step-by-step explanation:
A group of k elements can be chosen from a group of n elements in

ways.

There are 20 different 3-member groups.
Answer:
The sum of the marked angles = Total angles on the 4 straight lines – Sum of the interior angles of the quadrilateral. Sum of interior angles of polygon of 4 sides = (4 – 2) *1800 =3600
Hence, sum of the marked angles = 4 * 180° – 360° = 720° – 360° = 360°
Step-by-step explanation:
Hope it helps
Experimentation & principles of deductive logic.
The answer is a i’m pretty sure, if i’m incorrect then i’m sorry but i’m sure that it’s a :)