Here are the numbers:
1,3,6,10,15
2007-02-14 16:41:08 · 4 answers · asked by Jon 2 in Education & Reference ➔ Homework Help
1+2+3+4+5+6+7...
They add a number for each answer.
1
1+2
1+2+3
1+2+3+4
Same as above but its easier to see this way.
2007-02-14 17:10:01 · answer #1 · answered by Anonymous · 0⤊ 0⤋
1+2=3
3+3=6
6+4=10
10+5=15
therefore, the next in line would be:
15+6=21
2007-02-15 00:45:06 · answer #2 · answered by floozy_niki 6 · 0⤊ 0⤋
1-3-6-10-15
1(+2)-3(+3)-6(+4)-10(+5)-15
Starting with the number 1, we add 2 to make 3, and then we increase 2 by 1 and we get 3 and then we add 3 to 3 and we get 6. Then we add 1 more to 3 and we get 4 and then we add 4 to 6 to get 10 and so on.
2007-02-15 01:13:17 · answer #3 · answered by Mami of 3 3 · 0⤊ 0⤋
Try this function: n*(n+1)/2
n=1: 1*2/2=1
n=2: 2*3/2=3
n=3: 3*4/2=6
n=4: 4*5/2=10
n=5: 5*6/2=15
...
It is known as the triangle of Pascal.
I hope it helps.
2007-02-15 09:12:57 · answer #4 · answered by fw1806 2 · 0⤊ 0⤋