Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Explain briefly why the sum is referred to as the th triangular number.
MATHEMATICS · Subjective · CBSE · Mathematics · Number Play · Number Play
Problem
Explain briefly why the sum
1
+
2
+
3
+
⋯
+
n
1+2+3+\dots+n
1
+
2
+
3
+
⋯
+
n
is referred to as the
n
n
n
th triangular number.
Related theory
Sums of consecutive numbers
Number Theory Basics
Browse the problem library