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Anonymous
Anonymous asked in Science & MathematicsMathematics · 1 decade ago

# What is the missing number: 1/2,1/12,1/30,1/56,1/?,1/132?

### 6 Answers

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(12 - 2) = 10

10 + 8 = 18

18 + 12 = 30

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(30 - 12) = 18

18 + 8 = 26

26 + 30 = 56

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(56 - 30) = 26

26 + 8 = 34

34 + 56 = 90

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(90 - 56) = 34

34 + 8 = 42

42 + 90 = 132

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(Base - Previous Base) = x

(x + 8) + Base = Next Base.

• 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

• 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

• 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.

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• 1/2,1/12,1/30,1/56,1/90,1/132.....

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