3, 4, 7, 12, 19
2007-09-14 08:37:48 · 8 answers · asked by Dilara 2 in Science & Mathematics ➔ Mathematics
28
why
4-3=1
7-4=3
12-7=5
19-12=7
therefore
x-19=9
x=19+9
x=28
2007-09-14 08:48:29 · answer #1 · answered by GOLD-FLAW 2 · 0⤊ 0⤋
3+4 = 7
4+7+1 = 12
7+12 = 19
12+19+1 = 32
2007-09-14 08:48:36 · answer #2 · answered by Words Of Wisdom 3 · 0⤊ 0⤋
28
2007-09-14 08:47:02 · answer #3 · answered by Anonymous · 0⤊ 0⤋
28
2007-09-14 08:43:43 · answer #4 · answered by Anonymous · 0⤊ 0⤋
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
2007-09-14 08:50:52 · answer #5 · answered by koalahash 3 · 0⤊ 0⤋
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.
2007-09-14 08:59:22 · answer #6 · answered by Anonymous · 0⤊ 0⤋
28; differences are successive odd integers.
2007-09-14 08:43:29 · answer #7 · answered by John V 6 · 0⤊ 0⤋
28
You add 1, then 3, then 5....
2007-09-14 08:47:03 · answer #8 · answered by Wil T 3 · 0⤊ 0⤋