IF 1= 5; 2 = 10; 3= 30, Then 4 = ?

• ans-120
  since 1=5;
  2=2*5=10;
  3=3*10=30;
  4=4*30=120;
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• 120...
  as 1=5
  2=previous R.H.s no *present L.H.s number=10
  3=10*3=30
  similarly
  4=30*4=120
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• 120
  1=5
  2=10...5*2
  3=30...10*3
  4= 30*4
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