2007-03-14 02:04:00 · 19 answers · asked by Pavithra M 1 in Science & Mathematics ➔ Mathematics
7, 12, 19 . . .39
The pattern is 5, 7, 9, 11, 13 etc
7 + 5 = 12
12 + 7 = 19
19 + 9 = 28
28 + 11 = 39
39 + 13 = 52
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2007-03-14 03:40:47 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
The correct answer is (b) 28.
7 + 5 =12
12 + (5 + 2) = 12 + 7 =19
19 + (7 + 2) = 19 + 9 = 28 (missing number)
28 + (9 + 2) = 28 + 11 = 39
2007-03-14 13:01:13 · answer #2 · answered by Payal T 1 · 0⤊ 0⤋
The correct answer is (b) 28.
7 + 5 =12
12 + (5 + 2) = 12 + 7 =19
19 + (7 + 2) = 19 + 9 = 28
28 + (9 + 2) = 28 + 11 = 39
2007-03-14 09:15:14 · answer #3 · answered by mollyinlove 2 · 0⤊ 0⤋
Look at the difference between each pair of numbers. 7 + 5 = 12, 12 + 7= 19, so 19 + 9 = 28. Then 28 + 11 = 39, so I would use 28.
2007-03-14 09:13:37 · answer #4 · answered by Ken M 3 · 0⤊ 0⤋
Answer's 28
7+5=12
12+7=19
19+9=28
28+11=39
2007-03-14 10:26:23 · answer #5 · answered by M S B 2 · 0⤊ 0⤋
Look at the difference between each pair of numbers.
7 + 5 = 12,
12 + 7= 19,
so
19 + 9 = 28.
Then 28 + 11 = 39,
so I would use 28.
2007-03-16 00:02:53 · answer #6 · answered by Kinu Sharma 2 · 0⤊ 0⤋
It is definitly (b)28, Because..
7+(5)=12, 12+(7)=19, 19+(9)=28, 28+(11)=39
2007-03-14 10:14:00 · answer #7 · answered by sikandar p 1 · 0⤊ 0⤋
(b)28
Note : 12-7=5
19-12=7
28-19=9
39-28=11
Now note that 5+2=7, 7+2=9, 9+2=11 etc
2007-03-18 06:40:31 · answer #8 · answered by Govinda 3 · 0⤊ 0⤋
7 12 19 ? 39
The difference in series is as follows
7 + 5 = 12
12 + 7 =19
19 + 9 = 28 missing No.
28 + 11 = 39
Ans. is 28 option (a)
2007-03-14 09:12:09 · answer #9 · answered by Pranil 7 · 0⤊ 0⤋
Answer is 28. The difference between the numbers is 5.7,9,11.i.e12-7=5,19-12=7,28-19=9,39-28=11.
2007-03-14 10:35:07 · answer #10 · answered by khushi 2 · 0⤊ 0⤋
Here the increment added is incremented by 2 in each step
7+5=12
12+7=19
19+9=28
28+11=39
so ans is (b) 28
2007-03-15 14:01:04 · answer #11 · answered by $ri 3 · 0⤊ 0⤋