# What could be the next number in the following sequence?

• 09-27-2007, 05:19 PM
Dilara
What could be the next number in the following sequence?
3, 4, 7, 12, 19
• 09-27-2007, 05:20 PM
amar_chaba
28:
the differences between consecutive pairs of terms(a2-a1, a3-a2 etc ) aere:
1,3,5,7.
the next difference is 9, os the desired next number=19+9=28. ANS.
• 09-27-2007, 05:20 PM
GOLD-FLAW
28
why

4-3=1
7-4=3
12-7=5
19-12=7
therefore
x-19=9
x=19+9
x=28
• 09-27-2007, 05:21 PM
John V
28; differences are successive odd integers.
• 09-27-2007, 05:21 PM
koalahash
28, 39, 52, 65, ...

t0 = 3
t1 = t0 + 1 = 4
t2 = t1 + 3 = 7
t3 = t2 + 5 = 12
t4 = t3 + 7 = 19
t5 = t4 + 9 = 28

tn = 3 + (2n -1)

hope that helps
• 09-27-2007, 05:22 PM
WordsOfWisdom
3+4 = 7
4+7+1 = 12
7+12 = 19
12+19+1 = 32
• 09-27-2007, 05:56 PM
Wil T
28
You add 1, then 3, then 5....
• 01-09-2008, 09:25 AM
leepatel
i don't get it :(
It's too hard ;(
• 01-10-2013, 05:13 PM
tonydisalva
Hello
ans is
1)3+0=3
2)3+1=4
3)4+3=7
4)7+5=12
5)12+7=19
6)19+9=28
7)28+11=39
this sequence of the line
• 11-05-2014, 06:03 PM
pooja11
Answer of this question is 3+0=3
3+1=4
4+3=7
7+5=12
12+7=19
19+9=28
28+11=39
This is the right answer.