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Exercise
Directions :
Look carefully for the pattern, and then choose which pair of numbers comes next. Note also that you will be choosing from five options instead of four.
1.
10 20 25 35 40 50 55
  • A.
    70 65
  • C.
    60 75
  • E.
    65 70
  • B.
    60 70
  • D.
    60 65
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Answer : [E]
Explanation :
This is an alternating addition series, in which 10 is added, then 5, then 10, and so on.
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2.
8 22 12 16 22 20 24
  • A.
    28 32
  • C.
    22 28
  • E.
    22 26
  • B.
    28 22
  • D.
    32 36
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Answer : [C]
Explanation :
This is an alternating repetition series, with a random number, 22, interpolated as every third number into an otherwise simple addition series. In the addition series, 4 is added to each number to arrive at the next number.
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3.
40 40 31 31 22 22 13
  • A.
    13 4
  • C.
    4 13
  • E.
    4 4
  • B.
    13 5
  • D.
    9 4
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Answer : [A]
Explanation :
This is a subtraction series with repetition. Each number repeats itself and then decreases by 9.
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4.
28 25 5 21 18 5 14
  • A.
    11 5
  • C.
    11 8
  • C.
    10 5
  • B.
    10 7
  • D.
    5 10
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Answer : [A]
Explanation :
This is an alternating subtraction series with the interpolation of a random number, 5, as every third number. In the subtraction series, 3 is subtracted, then 4, then 3, and so on.
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5.
3 8 13 18 23 28 33
  • A.
    39 44
  • C.
    38 43
  • E.
    33 38
  • B.
    38 44
  • D.
    37 42
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Answer : [C]
Explanation :
In this simple addition series, each number is 5 greater than the previous number.
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