3,15,35,63......

• 15-3=12
  35-15=20
  63-35=28
  s0 the diff is 8.. so next no is 99
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• answer is 99...
  
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• Answer is 99.
  The difference between 15-3=12,35-15=20,63-35=28.
  Now if we add 8 to the resultant 12, we get 20. Similarly 20+8=28,28+8=36
  if we add 63+36, we get ans 99.
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• 15-3=12
  35-15=20
  63-35=28
  so next no is (28+8=36)
  means 63+36=99
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• next no is 99
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• 3*1=3
  5*3=15
  7*5=35
  9*7=63
  11*9=99
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