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What will come in place of the question mark (?) in each of the following series?

Q:

 15     12    17  10     ?    8    21     6 

  • 1
    3
  • 2
    7
  • 3
    21
  • 4
    19
  • 5
    इनमें से कोई नहीं
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Answer : 4. "19 "

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