7,11,13,17,?

• 7,11,13,17,19
  difference 4,2 are alternative in ..
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• ans. 19.
  7,11,13,17----
  alternately, 7+6=13
  11+6=17
  then, 13+6=19
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• ans=19
  its alternate difference of 4,2
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• 19 is the answer
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• this is series of prime no. begining from 7,
  so next term will be 19
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• ans=19
  alternate difference of 4,2.
  
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• 7+4=11
  11+2=13
  13+4=17
  17+2=19
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• 19 because of series if form by adding 4,2 alternatively
  
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• 7,11,13,17 then 19
  after one odd no.the next to next odd no. is skipped and the next one is mentioned.
  7 then 9 is skipped
  then 11 is mentioned then 13 is mentioned ,again 15 is skipped,then 17 and so the next would be19
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• as the series 11-7=4
  13-11=2
  17-13=4
  so the series 19-17=2
  so the next number is 19
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