Get the information you need from a community of experts on IDNLearn.com. Join our interactive community and access reliable, detailed answers from experienced professionals across a variety of topics.
Answer:
S(4) = 2
Step-by-step explanation:
S(n) = n(n - 3) / 2
S(4) = 4(4 - 3) / 2
= 4 x 1 / 2
= 4/2
= 2