31,41,61,91,?

• 131
  
  Explanation :
  
  To get nth number, add 10*(n-1) to the n-1 th number
  
  So 5th number = 4th number + 10 * 4 = 91 + 40 = 131.
  
  i.e 31
  41 = 31 + 10 * 1
  61 = 41 + 10 * 2
  91 = 61 + 10 * 3
  131 = 91 + 10 * 4
  and so on...
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• 31,41,61,91,?
  the sequence is increased by the difference of 10
  (i.e)10,20,30,40
  ans=131
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• 31,31+10,41+20,61+30,91+40=131
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