It is part of the series known as the triangular numbers.
21: (3)+3=(6)+4=(10)+5=(15)+6=(21)
5/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/21
The difference increases by one. 3, 6, 10, 15, 21, 28, 36 and so on.
7/10 of 15 = 15*7/10 = 21/2
25 + 15 + 21 + 10 + 11 = 82
21: (3)+3=(6)+4=(10)+5=(15)+6=(21)
5/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/21
The difference increases by one. 3, 6, 10, 15, 21, 28, 36 and so on.
They are 6, 10, 14, 15, 21, 22.They are 6, 10, 14, 15, 21, 22.They are 6, 10, 14, 15, 21, 22.They are 6, 10, 14, 15, 21, 22.
7/10 of 15 = 15*7/10 = 21/2
Points: (6, -10) and (-15, 15) Slope: (-10-15)/(6--15) = -25/21
25 + 15 + 21 + 10 + 11 = 82
Catch 21 - 2008 2009-10-15 was released on: USA: 15 October 2009
Yes. 15*(2/3) = 10 and 21*(2/3) = 14
10 and 21
21-28-36-45-55-66-74-87-101
Assuming it continues 15, 21, 28, ... then it is the triangular numbers.