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Q:

श्रेणी ( 12 - 22 + 32 - 42 + _____) के 2x पदों का योग होगा

  • 1
    x² ( 2x + 1 )
  • 2
    - x2 ( 2x + 1 )
  • 3
    x ( 2x + 1 )
  • 4
    -x ( 2x + 1 )
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Answer : 4. "-x ( 2x + 1 ) "

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