Verbal - Classification-oddwords -> Odd Numerals

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DIRECTIONS : In this type of questions, certain numbers are given, out of which all except one are alike in some manner while one is different and this number is to be chosen as the answer.
6. Choose the number which is different from others in the group.
  A.  7
  B.  15
  C.  31
  D.  57
7. Choose the number which is different from others in the group.
  A. 2
  B. 16
  C. 56
  D. 128

8. Choose the number which is different from others in the group.
  A.  21
  B.  39
  C.  63
  D.  83
9. Choose the number which is different from others in the group.
  A.  6
  B.  12
  C.  7
  D.  9
10. Choose the number which is different from others in the group.
  A.  325
  B.  236
  C.  178
  D.  639
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