what is the rule for :
2, 5, 11, 23, 47
I tried it like 5 times but i don't get it. HELP!!!
2006-11-21 10:46:02 · 6 answers · asked by Free hugs? x 2 in Science & Mathematics ➔ Mathematics
x-sub-1 (or x1) = 2
x-sub-2 (or x2) = 5
x-sub-3 (or x3) = 11
x-sub-4 (or x4) = 23
x1 + (x1 + 1) = 2x1 + 1 = x2
x2 + (x2 + 1) = 2x2 + 1 = x3
x3 + (x3 + 1) = 2x3 + 1 = x4
The pattern:
x-sub-(n+1) (where n is a positive non-zero integer) = [2*(x-sub-n) + 1], where x1 = 2.
2006-11-21 11:00:28 · answer #1 · answered by wheezer_april_4th_1966 7 · 1⤊ 1⤋
2 5 11 23 47
2 + 3 = 5
5+ 6 = 11
11 + 12 = 23
23+ 24 = 47
you will notice that the second number in each equation is a multiple of 3
double the difference between the two numbers add it the next number in sequence and you get the following number
the next number in sequence would be 95 by
47-23 = 24
24 * 2 = 48
47 + 48 = 95
2006-11-21 10:55:59 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Each new number is double the previous number plus one.
2 + 2 + 1 = 5
5 + 5 + 1 = 11
11 + 11 + 1 = 23
etc.
Best wishes.
2006-11-21 10:54:16 · answer #3 · answered by Doctor J 7 · 1⤊ 1⤋
from 2 to 5, you add 3
from 5 to 11, you add 6
from 11 to 23, you add 12
from 23 to 47, you add 24
that means for the next number, you add twice the number that you have to add to the previous sequence.
2006-11-21 10:50:24 · answer #4 · answered by Anonymous · 1⤊ 0⤋
Every numper multiple by 2 add 1
ex-2x2=4+1=5
5x2=10+1=11
2006-11-21 22:36:24 · answer #5 · answered by sam 3 · 0⤊ 1⤋
double the number and add 1.
The next number would be 55.
2006-11-21 10:50:50 · answer #6 · answered by swordski 2 · 1⤊ 2⤋