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.
51
The numbers are 21, 22, 23, 24, and 25.
True
Triangle numbers or triangular numbers are those numbers that can form an equilateral triangle when counting the objects. The first five triangular numbers are: 1, 3, 6, 10, 15.
1, 3, 6, 10, 15, 21
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.
No 859 is a number, to make a triangle you need to join up lines not numbers.
Depending upon the definition used, the first 10 natural numbers are either: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or (first appearing in the 19th century): 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
21, 21, 21, 21 , 15, 1
25
(n^2+n)/2
28 and 10 are both triangular numbers and add up to 38
how are the odd numbers arranged Pascal's Triangle?
Yes, 21 is a number in the Fibonacci sequence. Numbers are usually found by adding up 2 numbers.
20 and 1
78 42 are, as far as I can make out, two numbers. They do not make a triangle.78 42 are, as far as I can make out, two numbers. They do not make a triangle.78 42 are, as far as I can make out, two numbers. They do not make a triangle.78 42 are, as far as I can make out, two numbers. They do not make a triangle.