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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.
11.
61 57 50 61 43 36 61
  • A.
    29 61
  • C.
    31 61
  • E.
    29 22
  • B.
    27 20
  • D.
    22 15
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Answer : [E]
Explanation :
This is an alternating repetition series, in which a random number, 61, is interpolated as every third number into an otherwise simple subtraction series. Starting with the second number, 57, each number (except 61) is 7 less than the previous number.
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12.
84 78 72 66 60 54 48
  • A.
    44 34
  • C.
    42 32
  • E.
    38 32
  • B.
    42 36
  • D.
    40 34
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Answer : [B]
Explanation :
In this simple subtraction series, each number is 6 less than the previous number.
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13.
18 21 25 18 29 33 18
  • A.
    43 18
  • C.
    37 18
  • E.
    38 41
  • B.
    41 44
  • D.
    37 41
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Answer : [D]
Explanation :
This is a simple addition series with a random number, 18, interpolated as every third number. In the series, 4 is added to each number except 18, to arrive at the next number.
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14.
9 16 23 30 37 44 51
  • A.
    59 66
  • C.
    58 66
  • E.
    54 61
  • B.
    56 62
  • D.
    58 65
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Answer : [D]
Explanation :
Here is a simple addition series, which begins with 9 and adds 7.
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15.
9 11 33 13 15 33 17
  • A.
    19 33
  • C.
    33 19
  • E.
    19 21
  • B.
    33 35
  • D.
    15 33
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Answer : [A]
Explanation :
In this alternating repetition series, a random number, 33, is interpolated every third number into a simple addition series, in which each number increases by 2.
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