find missing numbers
3,8_,24,_,48,63
im never able to find answer ..plz tell me da method howto find answers in missing series...plz help
2007-04-21 06:30:13 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Hi,
This is not arithmetic - adding 5 again doesn't work. It is also not geometric because while 3 x (8/3) = 8, it is not true that 48 x (8/3) = 63.
Often times there will be a pattern in increasing or decreasing the amount you change by. Since going from 3 to 8 changed by 5, try changing the next time by 6, then by 7, etc. That would give:
3 (3 + 5 = 8) 8, (8 + 6 = 14) 14, (14 + 7 = 21, NOT 24 <== That means this was wrong.
Instead of increasing by just 1 each time, try increasing by 2:
(That means add 5 the first time, then add 7, then add 9, then add 11, etc.)
3 (3 + 5 = 8) 8, (8 + 7 = 15) 15, (15 + 9 = 24) WOW!! It worked!! So keep going!!
3, 8, 15, 24 Now add 11 to get
3, 8, 15, 24, 35 Now add 13
3, 8, 15, 24, 35, 48 Then add 15
3, 8, 15, 24, 35, 48, 63
So your pattern is you are adding increasing odd numbers each time.
I hope that helps!! :-)
2007-04-21 06:40:09 · answer #1 · answered by Pi R Squared 7 · 0⤊ 0⤋
3, 8, 15, 24, 35, 48, 63, 80...
The numbers are x(x+2)
2007-04-21 06:37:31 · answer #2 · answered by John S 6 · 0⤊ 1⤋
3=odd 8=even ?=odd 24=even ?=odd 63=even
if exists, check the choice having two odd numbers.
2007-04-21 06:44:04 · answer #3 · answered by iyiogrenci 6 · 0⤊ 0⤋
3+5=8
8+7=15
15+9=24
24+11=35
35+13=48
48+15=63
Just go adding the next odd number.
This series so is: 3,8,15,24,35,48,63
Hopefully I could help ya!
2007-04-21 06:36:00 · answer #4 · answered by queribeiro 2 · 1⤊ 1⤋