Answer:
-7k+21
Step-by-step explanation:
Answer:
S(1) = 1
S(n) = S(n-1) + n
Where S(n) is the sum from 1 till n
And,
S(n-1) is the sum from 1 till n-1
Answer:
Finite Set
Step-by-step explanation:
A finite set is a set that contains a fixed number of elements, that is, the elements are countable. However, the opposite of a finite set is an infinite set which does not have a fixed number of elements and is uncountable.
Examples of a finite set are
- The set of all past American Presidents
- The set of all persons in China
- The set of birds in Australia
a
Answer:
??You texted incomplete question.
By the way, x = 90
