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2015-10-13T20:22:22+05:30

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the answer to your question is option ( 3 ) 64.
        i hope that this will help u.
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a little explanation will do good.
2015-10-14T23:38:00+05:30

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These numbers seem to be in a series with common differences  being :
  23,  21,  19,  so the next one is  17...

so next number is  81 - 17 = 64

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