<span>When creating a subset of 5 elements from 7 elements, order should not matter. Therefore, we use the combination formula over the permutation formula.
The combination formula given n elements total and r elements used is n! / [r!*(n-r)!]. Substituting 7 for n and 5 for r, we get:
7! / (5!*2!) = 7*6 / 2 = 21
21 subsets can be created</span>
21x + 28 = 156 - 2
21x = 154 - 28
21x/21 = 126/21
X = 6
You didnt provide the selections, but some answers would most likely be rotations, translations, and reflections.
Answer:
66.7% = 0.667 in decimal form.
Hope that helps!
