2007-08-09 21:20:18 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
(12 - 2) = 10
10 + 8 = 18
18 + 12 = 30
-------------------
(30 - 12) = 18
18 + 8 = 26
26 + 30 = 56
-------------------
(56 - 30) = 26
26 + 8 = 34
34 + 56 = 90
-------------------
(90 - 56) = 34
34 + 8 = 42
42 + 90 = 132
----------------------
(Base - Previous Base) = x
(x + 8) + Base = Next Base.
2007-08-09 22:06:06 · answer #1 · answered by Sparks 6 · 0⤊ 0⤋
Find the missing number in:
1/2,1/12,1/30,1/56,1/?,1/132
The missing number is 90.
The pattern of the denominators is:
1*2, 3*4, 5*6, 7*8, 9*10, 11*12
= 2, 12, 30, 56, 90, 132
2007-08-10 04:41:06 · answer #2 · answered by Northstar 7 · 2⤊ 0⤋
1/2,1/12,1/30,1/56,1/?,1/132?
12 = 2 +10
30 = 12 + 18
56 = 30 + 26
? = 56 + 34 = 90
132 = 90 + 42
each time you add 8 more. Bingo.
the missing number is 90
1/2,1/12,1/30,1/56,1/90,1/132
2007-08-10 04:24:53 · answer #3 · answered by vlee1225 6 · 1⤊ 1⤋
12-2=10
30-12=18
56-30=26
10,18,26 are at a difference of 8
?-56=26+8
the next number is 26+8+56 which is 90.
2007-08-10 04:31:40 · answer #4 · answered by MathStudent 3 · 0⤊ 0⤋
1/2,1/12,1/30,1/56,1/90,1/132.....
2007-08-10 04:27:50 · answer #5 · answered by LadyRain_614 4 · 0⤊ 1⤋
86?
2007-08-10 04:25:29 · answer #6 · answered by ♥Blueberry 3 · 0⤊ 1⤋