0
Because it is ! The first 10 triangular numbers are... 1,3,6,10,15,21,28,36,45 & 55
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Is 21 a triangular number?
Yes, the number 21 is indeed a triangular number. Other triangular numbers are 6,10, and 15.
What is the 6th triangular number?
21
How do you find the 20Th triangular number?
The 20th triangular number is 20*21/2 = 210
Is 32 a triangular number?
32 is not a triangular number. The first few triangular numbers are 1, 3, 6, 10, 15, 21, 28, 36, 45, ...
Is 23 a triangle number?
No, 23 is not a triangular number. Here are a few examples of triangular numbers: 21, 28, 55, 45, 78 and 91.
What is the sixth triangular number?
Triangular numbers are numbers that are formed from the sum 1+2+3+4... The equation for the nth triangle number is (n2+n)/2 In this case, we want the sixth triangle number, so feed this into the equation: (62+6)/2 =(36+6)/2 =42/2 =21 Thus the sixth triangle number is 21.
Is 21 a triangular number?
Yes, the number 21 is indeed a triangular number. Other triangular numbers are 6,10, and 15.
What is the 6th triangular number?
21
How do you find the 20Th triangular number?
The 20th triangular number is 20*21/2 = 210
If 10 is the 4Th triangular number what is the 6Th?
21
Is 32 a triangular number?
32 is not a triangular number. The first few triangular numbers are 1, 3, 6, 10, 15, 21, 28, 36, 45, ...
If the eighth triangular number is 36 what is the seventh trianguler number?
28"21" but to be extra smart the answer is "The seventh triangular number is twenty one."
Is 23 a triangle number?
No, 23 is not a triangular number. Here are a few examples of triangular numbers: 21, 28, 55, 45, 78 and 91.
Is 8 triangular number?
No. The first few triangular numbers are 1, 3, 6, 10, 15, 21, 28, ...
Which number between 20 and 40 is both a triangular number and a square number 36 or 25 or 21 or 35?
36 is the only square number that is also a triangular number between 20 and 40.
Is 47 a triangular number?
47 is not a triangular number. Triangular numbers less than 100 are 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, and 91.
What triangular number has 4 factors?
6, 10, 15, 21, 55, 91...
