Use the formula (n+1)(n+2)/2, where n is the number on the highest double in the set. For a double 12 set: 13 x 14 / 2 = 91. For a double 9 set: 10 x 11 / 2 = 55 For a double 6 set: 7 x 8 / 2 = 28
2*15 = 30
3/5 * 15 = 9
sex
Double 15 is equal to 30
9/3*5=15
If 15 counters are the whole set, how many are 3/5 of the set 5
There are infinitely many such numbers. they belong to the set n*15 where n is any integer.
This treadmill inclines from 0 to 15 degrees. The incline is set with buttons on the display panel and can be set to a whole number between 0 and 15.
12
About 15 years. Sorry if I'm wrong!
24 counters = 8/824 * 5/8 = 15